 The conservative government of Maurice Duplessis and his Union Nationale dominated Quebec politics from 1944 to 1959 with the support of the Catholic Church.Pierre Trudeau and other liberals formed an intellectual opposition to Duplessis's regime, setting the groundwork for the Quiet Revolution under Jean Lesage's Liberals.The Quiet Revolution was a period of dramatic social and political change that saw the decline of Anglo supremacy in the Quebec economy, the decline of the Roman Catholic Church's influence, the formation of hydroelectric companies under Hydro-Québec and the emergence of a pro-sovereignty movement under former Liberal minister René Lévesque.