Passions : Criminal Perpetrator : Homicide many at once

Campo Elías Delgado Morales (14 May 1934 – 4 December 1986) was a Colombian spree killer, former US serviceman and self-described Vietnam War veteran who killed 29 people, and wounded 12 more, most of them at an upscale Bogotá restaurant called Pozzetto, before being shot dead by police. The event has since become known as the Pozzetto Massacre and is currently the deadliest shooting by a lone gunman in the country's history.

José Ernesto Medellín Rojas (March 4, 1975 – August 5, 2008), born in Nuevo Laredo, Tamaulipas, was a Mexican national who was executed by lethal injection for the murders of Jennifer Ertman and Elizabeth Peña in Houston, Texas.
Medellín was convicted of raping and killing 16-year-old Peña and 14-year-old Ertman in June 1993.His case gained notoriety when Mexico sued the United States in the International Court of Justice on behalf of 51 Mexican nationals asserting that the US had violated the Vienna Convention on Consular Relations, which requires that local authorities inform foreign nationals being held on criminal charges of their right to consult with their country's diplomats. That court ruled that the United States was obliged to have the defendants' cases reopened and reconsidered. The Supreme Court of the United States agreed to hear the case on May 1, 2007.The Bush administration briefed the Supreme Court on the obligation to comply with international treaties. On March 25, 2008, in Medellín v. Texas, the court rejected the Bush administration's arguments and cleared the way for Texas to execute the sentence. The International Court of Justice later ruled that the United States had violated its treaty obligations.

Christine Papin (8 March 1905 – 18 May 1937) and Léa Papin (15 September 1911 – 24 July 2001) were two French sisters who, as live-in maids, were convicted of murdering their employer's wife and daughter in Le Mans on February 2, 1933.
The murder had a significant influence on French intellectuals such as Jean Genet, Jean-Paul Sartre, Simone de Beauvoir, and Jacques Lacan, and was considered symbolic of class struggle by leftist polemicists. The case formed the basis of publications, plays, and films, as well as essays, spoken word, songs, and artwork.

Leonardo Conti (German pronunciation: [ˈleːonaʁdo ˈkɔnti]; 24 August 1900 – 6 October 1945) was the Reich Health Leader and an SS-Obergruppenführer in Nazi Germany. He was involved in the planning and execution of Action T4 that murdered hundreds of thousands of adults and children with severe mental and physical handicaps. On 19 May 1945, after Germany's surrender, Conti was imprisoned and in October hanged himself to avoid trial.