1974, 1975, 1983, 1987 and 2016. However, a joint sitting following a double dissolution pursuant to section 57 has only taken place once, in 1974. In 1914, the Joseph Cook Commonwealth Liberal Party sought to abolish preferential employment for trade union members in the public service, resulting in a double dissolution on 30 July 1914. In the election on 5 September 1914 the government was defeated by the opposition, Andrew Fisher's Australian Labor Party, and the bill was not pursued. In 1951, the Robert Menzies Liberal–Country Party coalition government sought to reverse the proposed nationalisation of the banks put in place by the Australian Labor Party government led by Ben Chifley. The repeal was opposed by the Labor Party in the Senate. Parliament was dissolved on 19 March 1951. In the election on 28 April 1951, the government was returned with a reduced majority in the lower house, but now with a majority in the Senate. The Commonwealth Bank Bill was presented to Parliament again on 26 June 1951 and passed both houses. In 1974, the Gough Whitlam Labor government was unable to pass a large number of bills through a hostile Senate. The government had announced a half-Senate election, but in the wake of the Gair affair, Whitlam decided to call a double dissolution on 11 April 1974, citing six bills as triggers. The bills included representation of the territories and for the setting up of Medibank. At the election of 18 May 1974, the government was returned, but still without a majority in the Senate. Sir Paul Hasluck's term as Governor-General ended on 11 July and the new Governor-General Sir John Kerr took office. The trigger bills were reintroduced and again rejected by the Senate and on 30 July Kerr approved Whitlam's request for a joint sitting. The coalition parties applied to the High Court on 1 August to prevent the joint sitting. One of the grounds was that the dissolution writs did not set out which "proposed laws" were the subject of the dissolution and that only one bill could be dealt with at a joint sitting. The court delivered a unanimous decision on 5 August 1974 and ruled that the sitting was constitutionally valid, that the joint sitting may deal with any number of trigger bills, and that provided the circumstances set out in section 57 had been satisfied then the Governor-General need not specify which