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.

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

This special episode examines previous cases to learn about the investigative techniques and innovations used by the FBI.

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.

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.

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.

Dartmouth Professors Susanne and Half Zantop are found brutally murdered in their New Hampshire home. With no trace of forced entry, the FBI Behavioral Science Unit found two teenagers were responsible for the heinous crime.

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.

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.

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.

The son of a successful real estate developer was kidnapped. After the father received a $3 million ransom demand, the FBI became involved. Criminal profiling helped track down the kidnapper.

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 December 1981, a New Jersey State Trooper was shot to death on the side of Interstate 80. Fingerprints on the suspect’s vehicle pointed to a fugitive wanted on bank robbery charges.

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.

A special task force was formed in the 1990s to combat the flow of Colombia cocaine into New York ports. As part of an elaborate sting operation, one detective went undercover and infiltrated a drug gang connected to Pablo Escobar’s Medellin cartel.

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.

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.

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.

After an Arkansas State Trooper is shot and killed, officers catch the murderer and find weapons and explosives in the man’s vehicle. Testing of the weapons leads them to a stand-off with a racist, anti-Semitic paramilitary group.

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.

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.

A sniper murdered two young black men as they jogged with two white women. The FBI placed their suspect on their Ten Most Wanted list and began an intense manhunt.

A armored car robbery near New York City left one guard dead and another critically wounded. The FBI suspected a large group of domestic terrorists with a history of violent crime.

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.