Conversation so far:
What types of things was Linus Pauling criticized for?
Linus Pauling's critics, including scientists who appreciated the contributions that he had made in chemistry, disagreed with his political positions and saw him as a naïve spokesman for Soviet communism.
Who opposed Linus Pauling's works?
Linus Pauling's peace activism, his frequent travels, and his enthusiastic expansion into chemical-biomedical research all aroused opposition at Caltech.
What political positions made Linus Pauling unpopular?
In an article entitled The Collaborators in the magazine's July 17, 1962 issue, Pauling was referred to not only as a collaborator, but fellow proponents of Soviet-style communism.

Question: Is there anything else unique about his political beliefs?
Self-contained rewrite: Is there anything else unique about Linus Pauling's political beliefs besides being seen as a fellow traveler of proponents of Soviet-style communism?