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An historian of socialism and of communism, he published a number of well known essays, notably on the Russian Revolution, Leninism and the history of the labour movement in Belgium. He was also an early initiator of Israeli-Palestinian dialogue. His intellectual methodology was engaged, critical and rigorous.
On July 9, 1943, Marcel's older brother, Henri, was arrested by the Gestapo and sent to Malines. Several weeks later, on July 31, he was transported to Auschwitz with 1,555 other deportees where he was in all probability sent to the gas chambers upon arrival as he had not yet turned 16 years of age. Henri was born October 15, 1927 in Brussels and died in August 1943. (Of the 1,556 deportees sent to Auschwitz on July 31, 1943, only 40 returned after the camps were liberated.)
From 1962 to 1967, he was editor of the weekly journal La Gauche (The Left) and in 1968 founded the journal Mai (May) which existed until 1973.
Riton Liebman, his son, is a comedian, author and director. Riton's actual name is Henri, named after Marcel's lost brother.
A foundation under the directorship Mateo Alaluf was created at the Université Libre de Bruxelles upon Marcel Liebman's death in 1986. In December 2005, the foundation was converted into the Marcel Liebman Institute. This Institute aims to contribute to socialist thought and the study of the left, as well as a critical reflection on the practices of social movements.
- "Introduction" in Isaac Deutscher, Russia After Stalin (Jonathan Cape, London, 1969).
- The Russian Revolution (Vintage Books, 1972).
- Leninism Under Lenin (Merlin Press, 1973).
- Born Jewish: A Childhood in Occupied Europe (Verso Books, 2005)
- "The Webbs and the New Civilisation," Survey, n° 41 (April 1962).
- "Communication on ‘Survey’ (letter)," New Left Review, n° 18 (January-February 1963).
- "1914: The Great Schism," Socialist Register, Vol. 1 (1964).
- "The Crisis of Belgian Social Democracy," Socialist Register, Vol. 3 (1966).
- "Israel, Palestine and Zionism," Socialist Register, Vol. 7 (1970).
- "Lenin in 1905: A Revolution that Shook a Doctrine," in Lenin Today: Eight Essays on the Hundredth Anniversary of Lenin’s Death, ed. by P. M. Sweezy & Harry Magdoff (New York: Monthly Review Press, 1970).
- "Isaac Deutscher as Historian of the Russian Revolution," in Isaac Deutscher: The Man and His Work, edit. by David Horowitz (London: Macdonald, 1971).
- "Bukharinism, Revolution and Social Development," Socialist Register, Vol. 12 (1975).
- "Reflections on Anti-Communism" (with Ralph Miliband), Socialist Register (1984) and Monthly Review, Vol. 37 (July 1985).
- "Preface" (with Ralph Miliband, John Saville, Marcel Liebman and Leo Panitch), Socialist Register, Vol. 22 (Social Democracy and After) (1985-1986).
- "Reformism Yesterday and Social Democracy Today," Socialist Register, Vol. 22 (1985-1986)
- "Beyond Social Democracy" (with Ralph Miliband), Socialist Register, Vol. 22 (1985-1986)
- "Trotsky assassiné," La Gauche (August 1965).
- "Lenin in 1905. A revolution that shook a doctrine," Monthly Review (1970).