The New Deal NRA briefly suspended antitrust law for two years.

Evidence

The National Recovery Administration (NRA) was an early New Deal piece of legislation that started in 1933 (later abolished by the Supreme Court in 1935). It essentially suspended antitrust law for two years, and it supervised the development of codes of fair competition. Consequently, the common law foundation of antitrust trust law became less important. — Philip Mirowski & Dieter Plehwe (eds.), The Road from Mont Pèlerin, 1195