Dick Clark, a Democratic Senator from Iowa, discovered the operation during a fact-finding mission in Africa, but Seymour Hersh, a reporter for "The New York Times", revealed IA Feature to the public on 13 December 1975. Clark proposed an amendment to the Arms Export Control Act, barring aid to private groups engaged in military or paramilitary operations in Angola. The Senate passed the bill, voting 54–22 on 19 December 1975, and the House of Representatives passed the bill, voting 323–99 on 27 January 1976. Ford signed the bill into law on 9 February 1976. Even after the Clark Amendment became law, then-Director of Central Intelligence, George H. W. Bush, refused to concede that all U.S. aid to Angola had ceased. According to foreign affairs analyst Jane Hunter, Israel stepped in as a proxy arms supplier for South Africa after the Clark Amendment took effect. Israel and South Africa established a longstanding military alliance, in which Israel provided weapons and training, as well as conducting joint military exercises.