The documents released to The Associated Press show the expanse of agents’ investigation into the film: seizing copies of the movie, having negatives analyzed in labs and interviewing everyone from actors and producers to messengers who delivered reels to theaters.

All of it in a failed attempt to stop the spread of a movie that some saw as the victory of a cultural and sexual revolution and others saw as simply decadent…

On various entries in the file, a checklist of top FBI brass appears in the top right corner, with initials next to some names. One of those listed is W. Mark Felt, the FBI second-in-command whose “Deep Throat” alias as a Watergate informant came from the movie’s title. However, none of the markings indicate he read any of the materials on the movie whose name became synonymous with his role in bringing down Richard Nixon’s presidency.