From 1930 to 1934, the Production Code was only somewhat helpful in fighting off calls for federal censorship. Things came to a head in 1934, with widespread threats of Catholic boycotts of immoral movies. The studios gave the MPAA full authority to enforce the Production Code on all studios. These strict rules of self-censorship lasted for decades. (The Code was finally set aside in the 1960s when the MPAA adopted the age-based rating system now in force.)