President William McKinley's assassination.

Leon Czolgosz.

Leon Frank Czolgosz
Leon Czolgosz circa 1900, unknown photographer
Born	May 5 1873. Alpena, Michigan, or Ohio, U.S.
Died	October 29, 1901 (aged 28) Auburn, New York, U.S.
Occupation	Steel worker
Criminal charge	First-degree murder
Criminal penalty	Death
Criminal status	Executed by electric chair
Parents	Mary (Nowak) and Paul Czolgosz.
Conviction(s)	Assassination of William McKinley

Leon Frank Czolgosz (Polish form: Czołgosz, Polish pronunciation: [ˈt͡ʂɔwɡɔʂ]; May 5 1873 – October 29, 1901; also used surname "Nieman" and variations thereof was a Polish-American former steel worker responsible for the assassination of U.S. President William McKinley.

In the last few years of his life, he claimed to have been heavily influenced by anarchists such asEmma Goldman and Alexander Berkman.