Thirty Years of Treason
Brecht Testimony p. 214

MR. STRIPLING: Yes. Have many of your writings been based upon the philosophy of Lenin and Marx?
MR. BRECHT: No, I don't think that is quite correct, but, of course, I studied, had to study as a playwright who wrote historical plays, I, of course, had to study Marx's ideas about history. I do not think intelligent plays today can be written without such study. Also, history written now is vitally influenced by the studies of Marx about history.
MR. STRIPLING: Mr. Brecht, since you have been in the United States, have you attended any Communist Party meetings?
MR. BRECHT: No, I don't think so.
MR. STRIPLING: You don't think so?
MR. BRECHT: No.
THE CHAIRMAN: Well, aren't you certain?
MR. BRECHT: No - I am certain, yes.
THE CHAIRMAN: You are certain you have never been to Communist Party meetings?
MR. BRECHT: Yes, I think so. I am here six years - I am here those - I do not think so. I do not think that I attended political meetings.
THE CHAIRMAN: No, never mind the political meetings, but have you attended any Communist meetings in the United States?
MR. BRECHT: I do not think so, no.
THE CHAIRMAN: You are certain?
MR. BRECHT: I think I am certain.
THE CHAIRMAN: You think you are certain?
MR. BRECHT: Yes, I have not attended such meetings, in my opinion.