The Doom Book was a list kept in the 1930s by United States censor Will Hays and major Hollywood studio moguls. The list included actors, actresses, directors, and others in the film industry whose private lives were "contrary to public morals" and who as a result should not be employed by the Hollywood studios. Inclusion on the list in the 1930s and 1940s meant instant unemployment for those, such as director James Whale or actor William Haines, who were homosexual, discovered to their cost. Homosexuality was one of the main reasons for inclusion in the Doom Book.
To avoid public scandal and blacklisting on Hays's list, many actors who were themselves gay, lesbian or bisexual concealed their sexuality and entered into "lavender marriages".
- Vito Russo, The Celluloid Closet: Homosexuality in the Movies (revised edition) Harper & Row, 1987. p.45