Leese returned to prison in 1947 when, along with seven other former members of the IFL, he was given a one-year sentence for helping escaped German prisoners of war, who had been members of the Waffen SS. In 1948, Leese formed the National Workers Movement in London. In December 1950 he stood trial for criminal libel on Harold Scott, Commissioner of the Metropolitan Police, but was acquitted. In 1951, he published his autobiography "Out of Step: Events in the Two Lives of an Anti-Jewish Camel Doctor".