What film studio boasted of having a stable with "more stars than there are in heaven"?

A 'star system' flourished in U.S. film studios. Irving Thalberg was responsible for promoting MGM's stars like no other. The 30s was the age of lavish glamour and sex appeal. MGM became the biggest, most predominant and most star-studded studio of all. It was 'The Home of the Stars.' It promised "more stars than there are in heaven." It had Jeanette MacDonald-Nelson Eddy musical films. And it also had high quality films due to great craftsmen, such as King Vidor, Victor Fleming, and George Cukor.

By 1934, MGM had over 60 famous actors under contract. MGM had the biggest stable of stars of all the studios. It had: Joan Crawford (originally a shop girl named Lucille Le Sueur), Clark Gable, Myrna Loy, William Powell, Greta Garbo, Norma Shearer, Jean Harlow, Robert Montgomery, Judy Garland, Mickey Rooney, Katharine Hepburn, Spencer Tracy, James Stewart, the Barrymores, and Spencer Tracy.

In the 1930s and 40s, the American film industry was dominated by five major corporate-style studios. Some of these studios originally rebelled against the MPPA (Motion Picture Patents Company). They exerted their influence over every aspect of the Hollywood motion picture industry. These following companies: 20th Century Fox (formed in 1935 from the merger of Twentieth Century Pictures, founded by Joseph Schenk, and the Fox Film Corporation); MGM (Metro-Goldwyn-Mayer, led by Louis B. Mayer); Paramount; Warner Bros.; and RKO Radio controlled budgets, personnel, scripts, publicity, etc.