There has been an active commie plot in America since the "progressive" era Woodrow Wilson was in all likelihood deeply involved in it rather than being just a marionette for his nominal superior "Colonel" Edward Mandell House. I think Oppenheimer definitely a former communist had lost all faith in it by WWII although Kitty was still a fellow traveller till she died.
To put as nastily as I can "You are who you screw." Kitty was a commie apologist to the end of her days, married to a dead commie before Bobby. Alger Hisses wife was tied up with Harry Hopkins' in the social work movement in NYC he, Hiss, his wife and brother were commies.
Weikel, read more.