Thanks for the welcome and I hope that everyone will enjoy my contributions. My first offering was actually first pointed out to me by one of my students in a class assignment.
President William McKinley was assassinated in September of 1901 by an avowed anarchist, Leon Czolgosz. Czolgosz confessed saying, "I killed President McKinley because I done my duty. I didn't believe one man should have so much service and another man should have none."
http://ublib.buffalo.edu/libraries/exhibits/panam/law/mckinley.html offers information on the Pan-American Exposition and President McKinley's assassination. An interesting link at the bottom of the page leads to articles from medical journals on President McKinley's death. For anyone interseted in medical history this offers very interesting facts about McKinley's last days. The official cause of death was gangrene.
Anarchy was a major concern in the US and many people thought that Czolgosz' act was part of a larger conspiracy, but none could be proved. To make your own opinion: http://ublib.buffalo.edu/libraries/exhibits/panam/law/czolgosz.html