In 1933, he attended a conference of left socialists, organised by the ILP. Following its conclusion, Smith and John Paton travelled to meet Trotsky.[5] After this meeting, he argued broadly in favour of the Fourth International until at least 1935.[6]
In 1939, he succeeded James Maxton as Chairman of the ILP. World War II began the same year, and the ILP opposed it, but in 1941 Smith surprised the party by announcing that he supported the prosecution of the war. As such, he resigned both from the ILP and his role as chair. Shortly afterwards, he joined the Common Wealth Party as its Research Officer, and in 1944 he succeeded Kim Mackay as the party chairman.[7] With the onset of the Cold War, Smith became increasingly anti-communist, and increasingly a proponent of Zionism.[8] Unable to gain support in Common Wealth for his ideas, he left in 1948.
^Upham, Martin (1980). "The British Section of the Left Opposition (November 1931–December 1933)". The History of British Trotskyism to 1949. Retrieved 29 September 2019.