In 1922 Torp was a delegate at the Fourth Comintern Congress. In 1923 the revolutionary wing that had assumed power in the Labour Party in 1918 had split into two wings, one for and one against Comintern membership. Torp belonged to the latter wing, which assumed power at the 1923 national convention. Torp was elected chairman of the entire party. Torp chaired the party until 1945. and was elected to the
Parliament of Norway in the
1936 Norwegian parliamentary election. By that time he had already become acting
Minister of Defence in
Nygaardsvold's Cabinet, filling in for
Fredrik Monsen who was ill. He was then
Minister of Social Affairs from November 1936 to July 1939, and
Minister of Finance from July 1939 to March 1942. In April 1940 Norway had been
invaded by Nazi Germany, and Torp was responsible for initiating the successful
flight of the Norwegian National Treasury. After overseeing the start of the flight, he fled together with the rest of Nygaardsvold's Cabinet. In
Åndalsnes he was injured in the foot during the German air raids. The Cabinet ultimately reached
Tromsø where they embarked for England, where they stayed until the war's end. Torp was acting Minister of Defence from November 1941 to February 1942, and then the permanent Minister of Defence from March 1942 to November 1945, in Nygaardsvold's and
Gerhardsen's First Cabinet. Torp was a former
antimilitarist, and was imprisoned for five months in 1924 as he called for a
military strike, but shed this ideology from the mid-1930s. Before the Second World War, Torp was also chairman of
Bærumsbanen from 1935 to 1940,
Oslo Sporveier from 1935 to 1940 and the Oslo airport committee from 1935 to 1940. He was a board member of
Folketeaterbygningen from 1935 to 1940,
Idrettskomiteen av 1935, and
Felleskomiteen for forstadsbanene from 1935 to 1940. He was a deputy board member of
Norges Kommunalbank from 1935 to 1940. All of these positions were lost when he fled the country. ==Post-war career==