 Together with Tibor Eckhardt he founded a charity named "First Aid for Hungary" in 1956 which helped the refugees of the Hungarian Revolution of 1956.Zwack became chairman of the Entrepreneurs' Party in 1992.Two years later he made an electoral alliance with SZDSZ, Fidesz and the Agrarian Alliance, according to which he was the joint candidate of the four parties in Kecskemét during the 1994 Hungarian parliamentary election.