[slibhb]

Feynman clearly did not lead an exemplary personal life but his second wife also accused him of being a communist so I'd take her testimony with a grain of salt.

[growingkittens]

I'm having difficulty finding a source for this to read more. The closest thing I found are a few blog posts that suggest it might have been her.

[slibhb]

You're right -- it's not known for a fact that the allegation came from her.