A wealthy Mississippi woman disappeared from her home in broad daylight. Left behind was a mysterious ransom note listing twelve names and no specific instructions. FBI and local police struggled to find answers in the cryptic message so they could find the kidnapper and retrieve the victim before her time ran out.

A series of brutal bank robberies and murders led to an exhaustive eight-month investigation by the FBI. What followed was the bloodiest firefight in FBI history.

In the season 3 finale, Drug gangs terrorized Harlem, New York neighborhoods. After a 10-year-old boy became a victim, the FBI formed a task force called C-11, designed to dismantle the gangs.

The body of an unidentified young woman turned up on a highway in a small Pennsylvania town. Agents persisted to identity the body and to find the killer.

A multiple murder-for-hire plot that was meticulously planned and executed. A mother, her 8-year-old son, and a live-in nurse were brutally murdered by an assassin. the FBI was able to zero in on Larry Horn, the father of the 8-year-old.

In the 1980s, gangs ruled the streets of Chicago. Led by Jeff Fort, the dangerous, power-hungry El Rukn gang attempted to conspire with Libya to perform acts of domestic terrorism for money.

Street gangs in Washington D.C. enforced their territories with lethal violence. Authorities vowed to bring the entire gang to justice while the gang leader had fled to Africa.

A couple engaged in a gruesome crime spree that spanned six states and left eight people dead-including children.

The decapitation of a young African-American male led the Miami-Dade PD and the FBI along a trail of murder. Investigators quickly discovered that the victim was a dissident member of a religious sect headed by a man calling himself Yahweh ben Yahweh, or God, Son of God.

On July 4, 1987, seven inmates broke out of a high-security prison in New Mexico. Murderer William Wayne Gilbert orchestrated the escape. In a manhunt, authorities and scientists used the Bureau’s crime laboratory to catch these dangerous criminals.

In the 1970s, a Croatian terrorist group linked to the National Resistance party committed acts against non-supportive Croatians living in the US. With the help of an informant, the FBI convicted members of crimes ranging from conspiracy to murder.

In 1980, a maid discovered that a copy machine, placed in a busy Las Vegas casino, was actually a bomb. Agents and bomb experts were called in to disarm the deadly device and stop the dangerous extortionist who built it.

A young woman was snatched from her home on a bright spring morning. After several days of searching, a former FBI profiler narrowed the suspect list to one.

Glendale, Arizona mall, local authorities and the FBI scrambled to recover its cargo of nearly a million dollars.

In 1987, Cuban prisoners at the Atlanta Federal Prison used homemade weapons to overthrow the staff. Soon, the inmates controlled most of the buildings, taking over 100 hostages. The FBI was forced to negotiate with the hostiles to end the standoff.

On a summer night in 1990, the body of a suspected drug courier was discovered burning in a Minnesota alley. The FBI worked with local police to uncover a crime ring run by a drug lord who used violence and intimidation to keep those around him silent.

The bodies of several women began turning up in and around the city of Vienna, Austria. Viennese police turned to the FBI for help.

He was a recluse who spread terror through the mail for 18 years. Two men died and more than a dozen were injured , but Ted Kaczynski wasn't known as the Unabomber until his brother tipped off the FBI. Kaczynski's Manifesto, published in major newspapers, set off a flurry of activity for the FBI: writing analysis and comparisons, DNA gleaned from a single postage stamp and finally, Kaczynski's arrest at his tiny cabin. The agents collected enough evidence, including the Manifesto itself, to convict Kaczynski. He is serving four life sentences plus 30 years with no chance of parole.

Posing as a fashion photographer, serial killer Christopher Wilder lured young women from shopping malls with promises of fame and fortune. Most ended up dead. national publicity that the FBI created led to the capture of the suspect.

After abducting and assaulting a girl at a bus stop, Maghfoor Mansoor was on the run from police and the FBI. From Vegas to Atlantic City, Mansoor left a trail of theft and violence until he was cornered in a hotel lobby.

In a suburb of Las Vegas, two robbers ambushed an armored car, killing both guards and seizing thousands of dollars. Authorities linked the crime to a series of armed robberies on gambling houses, including the MGM Grand Hotel and Casino.

Agents search for a young girl who was kidnapped while on a family camping trip, and hope the culprit's repeated calls to the child's mother can lead them to an arrest.

When an 80-year-old woman is found barely conscious next to the body of her murdered son in an abandoned van, the FBI was brought in and linked the crime to a teenager and middle-aged man.

An Indiana town was turned inside out when an officer was gunned down at point-blank range. A psychotic killer led investigators across the Midwest.

A 14-year-old girl ran away from her mother's home and disappeared without a trace. A farmer later discovered the young girl's remains in an Illinois barn.

Masked bandits pulled off a daring mid-day bank robbery. With no evidence leaving behind, the FBI forced their own luck.

By December 1985, John Gotti had assumed his place as the new Don of the Gambino crime family in New York with the assassination of his boss, Paul Castellano. When the FBI convinced Gotti's underboss, Salvatore Gravano , to testify against him, the jury came back with their verdict: guilty on all counts, including the murder of Castellano.

When notorious bank robber Byron Chubbuck escaped from New Mexico State Penitentiary in 2000, he almost immediately began stealing again. Though he claimed the stolen loot went to the poor, it was clear to the FBI Chubbuck was no folk hero.

A 12-year-old girl is abducted from her home. Scores of police officers and FBI agents determined to find the young girl before it is too late.

A class field trip ended with an 11-year-old girl missing. The FBI joined the investigation in an urgent search for the missing girl.

A teenage immigrant came to U.S. to realize her dream of becoming a doctor, but she found herself an innocent victim of the drug trade. While she was kidnapped, The FBI and local police determined to save the teenager’s life.

David Wilkey was shot to death on a hunting ground in rural Virginia. When this seemed to be an accident, investigators suspected foul play. Two years later, a man contacted North Carolina FBI agents with a complex story of conspiracy and murder-for-hire.

The hunt for serial killer Angel Resendiz, also known as the "Railroad Killer."

The 1997 Los Angeles Dunbar Armored robbery, the largest cash heist in United States history. Six masked robbers stole $18.9 million.

Bank robbers raided cities across seven states. The stakes were raised when the FBI discovered the robbers had an agenda beyond their personal wealth. The FBI needed to capture the leaders before their organization grew.

A young boy and his mother are kidnapped and murdered by a drug cartel.

In 1994, a rash of home invasions plagued the Detroit area. Each time, masked men disguised as police officers broke in with assault rifles and stole money and jewelry. But when one homeowner shot back, the identity of the intruders was revealed.

In 1985, a Lebanese terrorist and his accomplices hijacked Royal Jordanian Flight 405 in Beirut. Several Americans were on board. The FBI worked with other agencies to form Operation Goldenrod, a task force to bring the mastermind to justice.

In 1997, two men used a sledgehammer to break into a Camden, NJ, home. Police tracked the suspects to a nearby park but the criminals were able to escape after a shootout. When new clues emerged, the FBI was called in to locate the suspects.

In 1992, a Washington, DC professor was shot and killed as she tried to get into her car, the latest incident in a series of violent carjackings. One week later, a man robbed a bank and security cameras captured the same vehicle as the getaway car.

Six black males had been brutally murdered--two had their hearts cut out. The only thing connecting the victims was their ethnicity and the fact that each had been shot with .22 caliber bullets.

New Jersey millionaire Frank Black flew to Florida to close a major business deal and never came home. FBI Agents learned of a mystery woman in Florida who was meet Black. Eventually they untangled a web of deceit that led to a vengeance killing.

Three men murder an innocent man as part of an initiation into a Cleveland Ohio biker gang.

FBI agents began investigating New York gas station mogul Gurmeet Dhinsa for gas pump rigging. They learned that he enforced his mob-like operation with brutal violence.

In 1976, a car bombing in Washington DC’s Embassy Row claimed the lives of a former Chilean ambassador and his assistant. During the investigation, it became apparent to FBI agents that a foreign government had ordered the attack.

A U.S. Customs official disappears from his post near a Texas border crossing. The following day, the Customs official was found dead. Local police and the FBI continued searching for the suspects.

The FBI began a massive undercover operation designed to expose the Chicago Mafia's infiltration into the city's surrounding suburbs.

In the 1980s, the FBI investigated wide-scale corruption among the detectives of the San Juan, Puerto Rico Police Department. One detective broke the blue wall of silence and went undercover to help the FBI end the corrupt cops' activities.

A wealthy young mother was abducted in front of her in-laws’ home. To find the woman and her abductor, investigators would have to first determine the motive.

In 1993, a 74-year-old man is found suffocated in his home with his credit cards stolen. Investigators were alerted that the killers had used the man’s credit cards and with this information, the FBI was able to link the crime to an escaped prisoner.

A mother discovered her 10 year-old son was missing from his school. The search would cover a thousand miles. Agents were raced to find the kidnapper and the missing child.

In a Georgetown coffee shop, three employees were shot to death. Metro D.C. police turned to the FBI for help, hoping the Bureau’s technical expertise could bring justice for the victims of the triple homicide.

A Nebraska sheriff's deputy sees a man wanted for firearms violations and tries to arrest him. But the man begins shooting, leading to a high-speed pursuit and wounded cops. The FBI helps track the man across state lines

5-year-old Melissa Brannen disappeared from a Christmas party on Dec. 3, 1989, leaving behind a family wracked with anguish.

Young women were being abducted from their own front yards in broad daylight. The FBI was determined to put an end to the serial killer's deadly game of cat and mouse.

On June 19, 1985, convicted bank robber Terry Conner and his partner-in-crime, Joseph Dougherty, escaped on their way to Dougherty's trial. In September, the fugitives used Conner's old m.o. to make the biggest bank robbery in Wisconsin history.

In 1988, a criminal confessed that two prominent community members hired him to murder a South Carolina farmer. Police and FBI agents arrested a wealthy businessman and later learned that, even behind bars, he had the power to corrupt and kill.

In 1993, a robber surprised unsuspecting customers by dropping through the roof of a California bank. A local resident led police and FBI agents to the perpetrator. However, they learned that he had also masterminded a kidnapping – and had a hostage.

A marine salvager found the bodies of three drug dealers floating in a river. FBI agents suspected that a group of cops might be involved in illegal drug busts.

In the 1980s, an illegal drug operation known as the “K Street Crew” opened its doors in Washington, DC. Leader Vincent Hill ran the organization without mercy. The FBI created a task force to put an end to their deadly dealings.

In the 1970s and 80s, a Puerto Rican separatist group, FALN, set off bombs in major U.S. cities. Advocating complete independence for Puerto Rico, the group went on a major bombing spree and FBI agents found themselves racing against time to put a stop to their violent activities.

In the 1990s, a gang based in the U.S. Virgin Islands smuggled large amounts of cocaine into mainland America. In an investigation spanning from Georgia to South America, the FBI and DEA were able to identify the leader and bring down the drug ring.

No suspect had emerged after the rapes and murders of ten women near Tampa, Florida in 1984. When one of the killer's victims survived, the FBI was able to identify 31-year-old Bobby Joe Long as the suspect. Long was later convicted on eight of the murders and rape.

An escapee from Castro's Cuba was the mastermind behind terrorist organization Omega 7. This group sought to carry out their mission through bombings and assassinations, financing their crimes through extortion and by aiding drug traffickers.

Two young men went on a crime spree of robbery, kidnapping and murder, and then disappeared. The pursuit would take FBI agents across six states.

A gunman fired into rush hour traffic. The brazen daytime shooting of employees from the Central Intelligence Agency stunned the country.

A 13-year-old was kidnapped on her way to school. The father drove hundreds of miles through the night to deliver the ransom cash to rescue his young daughter.

A series of bizarre shootings terrorized the small town of East Point, GA, and left two people dead and two others critically wounded. As the body count climbed, the killer taunted law enforcement with mysterious notes.

The body of 23 year old Robin Bishop was discovered near her car on a remote highway. After acquitted in two state trials, Gwaltney was convicted of the murder in the federal trial. The FBI was able to convince the third jury.

Domestic terrorism is an especially vivid threat to Americans; the FBI has created specialized teams to root out and dismantle terrorist operations, and put away those criminals whose secretive, leaderless cells are well armed and very dangerous.

The Los Macheteros terrorist organization sought to end U.S. rule of Puerto Rico through extreme violence. When the group claimed they attacked 18 unarmed servicemen traveling near San Juan, the FBI was called to investigate the ruthless killers.

After a parole officer was found shot dead in his car, the FBI, DEA and NYPD struggled to contain gang-related drug violence. Authorities sought to put two drug kingpins, Howard “Pappy” Mason and Lorezno “Fat Cat” Nichols, behind bars for the crime.