For more than three decades, Hollywood movies were shaped by a set of rules called the Hays Code. Officially known as the Motion Picture Production Code, it was introduced in 1930 and strictly enforced beginning in 1934. Named after Will H. Hays, the president of the Motion Picture Producers and Distributors of America, the code was meant to prevent government censorship and calm public outrage over “immoral” films.

The rules were sweeping and sometimes oddly specific. Profanity and slang such as lousy or cripes were banned, along with the Bronx cheer. Words like pregnant were considered indecent. Married couples could not share a bed on screen, clergy could not be portrayed as flawed, and criminals always had to face punishment by the final act. Dances had to keep performers’ feet moving, kisses had to be cut short, and religion could not be ridiculed in any form. Even ordinary slang and silly sounds could be censored if they were judged inappropriate.

For decades the code shaped everything from screwball comedies to film noir. But by the 1950s and 60s, social change, foreign films, and bold directors pushed against the restrictions. Movies like Psycho (1960) and Bonnie and Clyde (1967) proved audiences wanted something more daring.

In 1968, the Hays Code was finally abandoned. It was replaced with the MPAA ratings system, which classified films by age suitability rather than banning content outright. That shift gave filmmakers far more freedom and opened the door to the modern era of American cinema. Its influence, however, never disappeared, since the language of suggestion, innuendo, and ratings that it left behind still shapes how films are made and watched today.