District of Columbia City Hall Scott Key, (1779–1843), and was sentenced to a mental institution. The building was also the site of the 1867 trial of John Surratt, an alleged conspirator in the assassination of Abraham Lincoln who was later acquitted. However, Charles J. Guiteau, the assassin of President James A. Garfield, was convicted at the courthouse in 1882. The Old City Hall was the scene of a fugitive slave trial known as the "Pearl incident," which was the largest single escape by slaves attempted in U.S. history. Two men were convicted in 1848 of attempting to free more than 70 slaves by sailing them
Charles J. Guiteau Scoville then became lead counsel for the defense. While Scoville's legal experience lay in land title examination, he had married Guiteau's sister and was thus obliged to defend him in court when no one else would. Wayne MacVeagh, the U.S. Attorney General, served as the chief prosecutor. MacVeagh named five lawyers to the prosecution team: George Corkhill, Walter Davidge, retired judge John K. Porter, Elihu Root, and E.B. Smith. Guiteau's trial was one of the first high-profile cases in the United States where a defense based on a claim of temporary insanity was considered. Guiteau vehemently insisted that while he