The name of the group was in honor of the American anarchist Leon Czolgosz, who on September 6, 1901 assassinated then-United States President William McKinley with two bullets at point-blank range.

Targets included banks (about a third of the bombs), police stations, army barracks, churches, embassies, the headquarters of political parties, company offices, courthouses and government buildings.

Some groups named themselves after former anarchists around the world, including Leon Czolgosz, who assassinated US President William McKinley in 1901, and Jean-Marc Rouillan, an imprisoned French leftist militant.

[25][26][27][28] On October 15, 2008, members of the group abandoned an explosive device in the parking lot of the casino belonging to the Chilean Investigative Police, located in the Plaza Brasil commune.

[31] It was not until 2009 that the group, together with the Severino di Giovanni Antipatriot Band and Jean Marc Rouillan Armed and Heartless Columns produced a document announcing more attacks, although they did not claim another.