Being Categorized
Those were the days when an actor could get away with playing a variety of roles. Actors were recruited as leads, supporting characters, or extras, and everyone was typecast. You got to play the parts that your contract demanded, and once the studio found an iconic character type for you, that one was your forever area.
No Privacy
In addition, celebrities did not finish their project at the end of the day. To make sure that they stayed marketable, studios focused, particularly on their personal lives. Nobody was allowed to be gay, and problems like pregnancies and substance abuse were prohibited.