Hashomer Hatzair
Born in Odessa in the Russian Empire (today in Ukraine), Dranitzki joined Hashomer Hatzair after it had been banned by Soviet authorities. In 1925 he made aliyah to Mandatory Palestine, where he joined Poale Zion Left. He was amongst the founders of the Marxist Studies Group and the Socialist League, and was an activist for the Hashomer Hatzair Workers Party and later Mapam.