The Popular Front in the United Kingdom attempted an alliance between political parties and individuals of the left and centre-left in the late 1930s to come together to challenge the appeasement policies of the National Government led by Neville Chamberlain. The Popular Front (PF), despite not having the formal endorsement of either the Labour Party or the Liberal Party, fielded candidates at parliamentary by-elections with success. There was no general election to test the support of the PF, and therefore the opportunity for it to form a government.