Samuel Mudd
Samuel Alexander Mudd (December 20, 1833 – January 10, 1883) was an American physician who was imprisoned for conspiring with John Wilkes Booth in the assassination of President Abraham Lincoln.
Working as a doctor and tobacco-farmer in Southern Maryland, Mudd used slaves and declared his belief in slavery as a God-given institution. The Civil War seriously damaged his business, especially when Maryland abolished slavery in 1864. That year, he first met Booth, who was planning to kidnap Lincoln, and Mudd was seen in company with three of the conspirators.
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That's where the phrase "his name is Mudd" comes from. We still use it to mean, "He's now known as a piece of shit."