The Ukrainian Revolutionary Democratic Party (Ukrainian: Українська революційно-демократична партія, romanized: Ukrainska revoliutsiino-demokratychna partiia), known from 1990 as the Ukrainian Democratic Republican Party, was a socialist political party active in the Ukrainian diaspora following the Second World War. The founders of the URDP were: Ivan Bahrianyi, Hryhoriy Kostyuk, Ivan Maistrenko, Borys Levitsky, Semen Pidhainy, and others. They published Vpered (Forward) edited by Ivan Maistrenko. Source: Wikipedia (en)