The Office of the General Counsel was established in 1935 to oversee the Legal Division. After the passage of the Taft-Hartley Act in 1947, the General Counsel became independent from the National Labor Relations Board and was responsible for the investigation and prosecution of unfair labor practice cases and for the general supervision of the NLRB field offices in the processing of cases.
The General Counsel, whose service began prior to 1947 were appointed by the National Labor Relations Board (NLRB); those whose terms began subsequently were appointed by the President and confirmed by the Senate for a 4-year term.
From the US National Archives Authority Record id: 10515445