George Andrew Atzerodt (June 12, 1835 – July 7, 1865) was a German American repairman, Confederate sympathizer, and conspirator in the assassination of U.S. President Abraham Lincoln. He was assigned to assassinate Vice President Andrew Johnson, but lost his nerve and made no attempt. Atzerodt was tried by a military tribunal, sentenced to death for conspiracy, and hanged along with three other conspirators. Wikipedia
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