High Quality Content by WIKIPEDIA articles! The Overman Committee was a special subcommittee of the United States Senate Committee on the Judiciary chaired by North Carolina Democrat Lee Slater Overman. Between September 1918 and June 1919, it investigated German and Bolshevik elements in the United States. It was an early forerunner of the better known House Un-American Activities Committee, and represented the first congressional committee investigation of communism.