Urbany was one delegates at the socialist congress at Differdange, that voted for affiliation to the Communist International. He was a founder of the Young Communist League of Luxembourg. He became general secretary of the Communist Party of Luxembourg in 1936. He was elected to parliament in 1945, leading the communist faction. He remained in parliament for three decades. In 1965 he became chairman of the Communist Party.
- World Marxist Review. 1976. p. 26.