Silverman was a lecturer in English at the National
University of Finland from 1921 to 1925, and then returned to the University of Liverpool to teach and read law. After qualifying as a
solicitor, he worked on workmen's compensation claims and landlord–tenant disputes. From 1932 to 1938, Silverman served on
Liverpool City Council. He contested
Liverpool Exchange without success at a
by-election in 1933, but was elected as
Member of Parliament (MP) for
Nelson and Colne in the
general election in 1935. , addressed to Sydney Silverman in August 1942, was one of the first pieces of evidence of the implementation of the
Final Solution by the Nazis. Silverman was prominent in his support for
Jews worldwide and for their rights in
Palestine. He rethought his pacifism in light of the reports of
antisemitism in
Europe, and reluctantly supported Britain's entry into the
Second World War. He was vocal in asking from the government (and
Churchill in particular) for a statement of war aims, which had become a contentious issue in the early years of the war. Silverman was prominent within the debates over the potential repatriation of Jewish refugees, telling Churchill "that it would be difficult to conceive of a more cruel procedure than to take people who have lost everything they have – their homes, their relatives, their children, all the things that make life decent and possible – and compel them against their will, to go back to the scene of those crimes". Silverman was an ardent
Zionist who criticized the
anti-Zionist policies of
Ernest Bevin. He denied the
Nakba, claiming that the
Israelis "did their utmost to persuade them
[Palestinian Arabs] to stay." Silverman was widely expected to join the government after the Labour victory in the
general election in 1945, but, as he came from and stood prominently for the left of the Labour Party, he was not appointed by
Clement Attlee. He became opposed to the government's foreign policy. He refused to support German rearmament in 1954 and had the Labour
Party Whip withdrawn from November 1954 to April 1955. He was one of the founders of the
Campaign for Nuclear Disarmament. In 1961, as a protest against
bipartisan support for British
nuclear weapons, he voted against the
Royal Air Force,
Royal Navy and
British Army estimates in the
House of Commons, and was suspended from the Labour Party Whip from March 1961 until May 1963. Silverman died on 9 February 1968 following a stroke. ==Opponent of capital punishment==