Marilyn's House Was Bugged

According to author John William Tuohy, multiple groups tuned in to hear the goings on at Marilyn's house, including the FBI, the Mafia, the Teamsters, and at least one movie studio. The Teamsters were listening in because leader Jimmy Hoffa wanted dirt on Bobby Kennedy, Marilyn's alleged paramour who had been after Hoffa for a while. The FBI wanted to find out how deep Marilyn's knowledge went in relation to Frank Sinatra's connections to the Mob. The Mafia wanted in on whatever she knew about the FBI through her high-ranking beaus. No one really knows what the movie studios wanted. What did the eavesdroppers hear?