The Democratic Party, initially known as Our Party, was formed in May 1969 by Desmond Donnelly, who had been a Labour MP for Pembrokeshire, but had resigned the whip in January 1968 and been expelled by the party two months later. His Constituency Labour Party supported him and was disaffiliated from the party along with Donnelly's expulsion. The party wound up in April 1971 when Donnelly joined the Conservative Party, without even informing the Democratic Party's membership.