Agitation for legislation to regulate the packers persisted into the Warren Harding administration despite the decree. The United States Congress sought to protect farm profits through the Emergency Tariff of 1921 on May 27. Congress passed the Packers and Stockyards Act on August 15, 1921 as H.R. 6320 and the law went into effect in September 1921. Congress would go on to pass the Future Trading Act the next week and granted farmers' co-ops broad antitrust immunity in the Capper–Volstead Act on February 18, 1922.