 De Laveleye was a doctor in law, and was municipality Council member of Sint-Gillis, President of the Liberal Party (1936–1937) and Liberal member of parliament (1939–1945) for the district Brussels.De Laveleye was minister of justice (1937) and of public education (1944–1945).During World War II he was newsreader for Radio Belgique, a BBC station transmitted to occupied Belgium.