John Wayne Gacy (March 17, 1942 - May 10, 1994) also known as The Killer Clown, was an American serial killer.

He was convicted and later executed for the rape and murder of 33 boys and young men between 1972 and his arrest in 1978, 27 of whom he buried in a crawl space under the floor of his house, while others were found in nearby rivers. He became notorious as the "Killer Clown" because of the many block parties he threw for his friends and neighbors, entertaining children in a clown suit and makeup, under the name of "Pogo the Clown." He was also in the Guinness Book of World Records for the longest sentence imposed on a mass murderer; he was given 21 consecutive life sentences and 12 death sentences.

Andrew Phillip Cunanan (August 31, 1969 – July 23, 1997) was a Filipino American spree killer who murdered five people, including fashion designer Gianni Versace, during a three-month period in 1997, ending with Cunanan's suicide, at age 27. On June 12, 1997, Cunanan became the 449th fugitive to be listed by the FBI on the FBI Ten Most Wanted Fugitives list, and became the first person from San Diego to be placed on that list.

Timothy James McVeigh (April 23, 1968 – June 11, 2001) was a United States Army veteran and security guard who was convicted of bombing the Alfred P. Murrah Building in Oklahoma City on April 19, 1995, the second anniversary of the Waco Siege, as revenge or to inspire revolt against what he considered a tyrannical federal government. The bombing killed 168 people, and was the deadliest act of terrorism within the United States prior to the September 11, 2001 attacks[citation needed]. He was convicted of 11 federal offenses, sentenced to death, and executed on June 11, 2001.