Abraham (Abram) Leon (1918–1944) (born Abraham Wejnstok), was a Belgian Jewish Trotskyist party leader and theorist.Leon was born in Warsaw in 1918. His parents, adherents of "official petit-bourgeois Zionism", left Poland to pursue the Zionist dream in Palestine; the family quickly re-emigrated in 1926 to Belgium. Leon became a member and then leader of the Belgian branch of Hashomer Hatzair, a left wing Zionist youth movement. In 1936, after hearing speeches of the Trotskyist leader Walter Dauge of the Revolutionary Socialist Party to militant Belgian coal miners, Leon was won over politically from Stalinism to Trotskyism. Between 1936 and 1940 Leon slowly and methodically made his political transition from the Hashomer Hatzair to revolutionary Trotskyism. Wikipedia
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