The Parliamentary Labor Party (also known as the Premiers' Plan Labor Party or Ministerial Labor Party) was a political party active in South Australia from August 1931 until June 1934. The party came into existence as a result of intense dispute, especially within the Australian Labor Party, about the handling of the response to the Great Depression. In June 1931, a meeting of state premiers agreed on the Premiers' Plan, which involved sweeping austerity measures combined with increases in revenue. In August 1931, the South Australian state conference of the Labor Party expelled the 23 of the 30 lower house and the 2 of the 4 upper house Labor MPs who had voted for it, including Premier Lionel Hill and his entire Cabinet.