His wife allegedly secretly reported him to the FBI as a potential spy, communist, security risk, fraud. It was an anonymous letter.

Given how different this wife's (second wife) description of Feynman compared to others is, that there are no record of complaints from first wife, the way her younger sister describes him, it could well be an earlier repeat of the now familiar Johnny Depp story, where it's not initially clear who the abusive person here is.

The marriage was certainly not a happy one and some people turn vindictive, turn to smearing characters. Especially if the person has narcissistic tendencies.

[Who Smeared Feynman] https://blog.nuclearsecrecy.com/2014/07/11/smeared-richard-f...

Submitted at https://news.ycombinator.com/item?id=46974999