The 1974 South African general election, held on 24 April, was called one year earlier than scheduled by Prime Minister John Vorster on 4 February. The House of Assembly was increased from 166 to 171 members. The Progressive Party made a major advance. In addition to Helen Suzman, re-elected for Houghton, five other members won seats including the party leader Colin Eglin. A seventh member of the caucus was elected at a by-election soon after. The United Party won 41 seats. The election would also see Harry Schwarz, leader of the United Party in the Transvaal, enter Parliament, who would soon lead a break away from the United Party and would become one of the Apartheid's most prominent opponents in Parliament.