When you have Steve Nelson over to tea, see "Venona Papers" and others, you have a commie plot. Steve was the commissar of the Abe Linclon Brigade and later head of the commie underground on the left coast, see the Yale University series on the American Commie Party.
While we are at it I campained for Nixon and even then I thought he had his head up his butt, see EPA.
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.