Union Nationale Conservative fortunes were further hurt by the Conscription Crisis of 1917 when the federal Conservative government of Sir Robert Borden invoked conscription against the opposition of Quebec. This led to riots in the province. In 1933, Maurice Duplessis became leader of the Quebec Conservatives. The next year, the ruling Liberal party split when a group of nationalist Liberals dissatisfied with the government of Louis-Alexandre Taschereau bolted from the party to form the Action libérale nationale or ALN. Duplessis wooed the dissident party and, two weeks before the 1935 election, the Conservatives and ALN formed a "Union Nationale" alliance to contest the election. On June 20, 1936 the Quebec Conservative Party dissolved when the alliance became a formal merger into a single political party, the Union Nationale. Two months later, the UN took power in the 1936 election under the leadership of Duplessis. The party was unexpectedly defeated in 1939, but went on to dominate Quebec politics from 1944 until Duplessis died in 1959. The Union Nationale formed the government again from 1966–1970 and afterwards went into rapid decline, being supplanted by the Parti Québécois as the main opposition to the Liberals. Federal Tories and Quebec after the Union Nationale Since the late 1960s, the main divide in Quebec politics was between supporters of Quebec separatism and federalism, rather than the traditional conservatism and liberalism. This resulted in a reorientation of Quebec politics with the conservative Union Nationale collapsing in the early 1970s and the new polarization in Quebec politics being between the separatist Parti Québécois and the federalist Quebec Liberal Party. Federalists, whether conservative or liberal, generally supported the Liberals with federalist former Union Nationale members joining that party in the 1970s while more nationalist UN members joined the PQ. This reorientation could be seen in the family of former Union Nationale premier Daniel Johnson, Sr. whose son, Daniel Johnson, Jr. joined and eventually became leader of the Quebec Liberals while his brother, Pierre-Marc Johnson, joined and eventually led the PQ. Claude Wagner, a judge and a prominent Quebec Liberal cabinet minister who departed provincial politics in 1970, ran successfully as a Progressive Conservative in the 1972 federal election, and was the front-runner in the party leadership convention in 1976 before losing on the final ballot to Joe Clark. When Bourassa returned to politics in the 1980s, he worked closely with the federal Progressive Conservatives led by Brian