His wife was a self-professed Marxist
and his security clearance was revoked in '45 after it became apparent that he'd lied about his meetings with fellow communists during his Los Alamos phase.
He was a preening peacock and drama-queen.
(Happybara The jungle came alive and took him, Tue 10 May 2011, 11:14, 1 reply, 15 years ago)

He was one of the greatest physicists to walk the earth
that earns him the right to be a drama-queen.

And those "meetings" were supposedly the odd social event, although since neither of us were there, I don't think either of us can be sure.

Incidentally, he couldn't have had his security clearance revoked. He never had security clearance at Los Alamos.
( the mighty badger Aphrodite, on a bar stool, by your side, Tue 10 May 2011, 11:22, Reply)

But, but
he was the one who persuaded the US goverernment to BUY Los Alamos because it was near his New Mexico bolt-hole. He was head of weapons development there - of course he had security clearance. Still, meh. I've just got a chip because Enrico Fermi should really be the household name that Oppenheimer became.
(Happybara The jungle came alive and took him, Tue 10 May 2011, 15:18, Reply)