Hart was secretary to the Excise Commission,
Washington, D.C. from 1913 to 1917, and chief field deputy, Internal Revenue Bureau from 1916 to 1921. He was admitted to the District of Columbia bar in 1924 and to the New Jersey bar in 1925. He practiced law in Jersey City since 1927 and was assistant corporation counsel of Jersey City from 1930 to 1934. He was chairman of the
New Jersey Democratic State Committee from 1944 until 1953.
Congress He was elected as a
Democrat to the Seventy-fourth and to the nine succeeding Congresses, serving in Congress from January 3, 1935 – January 3, 1955. In Congress he was chairman of the Committee on War Claims (Seventy-eighth Congress),
House Committee on Un-American Activities (Seventy-ninth Congress) and the
House Committee on Merchant Marine and Fisheries (Eighty-first and Eighty-second Congresses). He was not a candidate for renomination in 1954.
Later years After leaving Congress, Hart was a member of State Board of Public Utility Commissioners from 1955 to 1960. == Personal life and death ==