The Children's Hour and McCarthy Hearings parallels

What are the McCarthy hearings?

In reference to the play "The Children's Hour" by Lillian Hellman, what was Hellman's relationship with the McCarthy Hearings? What was the outrage in Hollywood in relation to the hearings?

How does the below quote relate to the hearings and the play?

"To hurt innocent people whom I knew many years ago in order to save myself is, to me, inhuman and indecent and dishonorable. I cannot and will not cut my conscience to fit this year's fashions, even though I long ago came to the conclusion that I was not a political person and could have no comfortable place in any political group."

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