Hollywood Blacklist

The Hollywood blacklist—as the broader entertainment industry blacklist is generally known—was the practice of denying employment to screenwriters, actors, directors, musicians, and other American entertainment professionals during the mid-20th century because they were accused of having Communist ties or sympathies. Artists were barred from work on the basis of their alleged membership in or sympathy with the Communist Party USA or refusal to assist investigations into the party's activities. Even during the period of its strictest enforcement, the late 1940s through the late 1950s, the blacklist was rarely made explicit or verifiable, but it directly damaged the careers of scores of individuals working in the film industry.

The first systematic Hollywood blacklist was instituted on November 25, 1947, the day after ten writers and directors were cited for contempt of Congress for refusing to testify to the House Un-American Activities Committee. A group of studio executives, acting under the aegis of the Motion Picture Association of America, fired the artists—the so-called Hollywood Ten—and made what has become known as the Waldorf Statement.

On June 22, 1950, a pamphlet entitled Red Channels was published. Focused on the field of broadcasting, it identified 151 entertainment industry professionals in the context of "Red Fascists and their sympathizers." Soon, most of those named, along with a host of other artists, were barred from employment in most of the entertainment field.

The blacklist lasted until 1960, when Dalton Trumbo, a Communist Party member from 1943 to 1948 and member of the Hollywood Ten, was credited as the screenwriter of the highly successful film Exodus, and later publicly acknowledged by actor Kirk Douglas for writing the screenplay for the movie Spartacus. A number of those blacklisted, however, were still barred from work in their professions for years afterward.

...
Wikipedia