Famous for having assasinated President William McKinley. Czolgosz was born to Polish parents and like most assasins, had a history of mental problems. Being exposed to anarchist doctrines as a young man didn't help matters any. Czolgosz believed that the US government was the enemy of the working man.
This really bugged him but alas, the year was 1901 and Rage Against the Machine wouldn't be in full effect for another 90 years. Czolgosz decided that he had to kill McKinley. At the Pan-American Trade Expo in Buffalo, NY Czolgosz got his chance. McKinley reached out to shake the young man's hand and Czolgosz shot him twice with a gun hidden in a hanky. McKinley died and Czolgosz was executed in October of the same year.