what was your the source for "there were communist spies by the way?"
I think the names of Klaus Fuchs, Julius Rosenberg and David Greenglass are sufficiently common knowledge that we can dispense with citations.
Just as a matter of interest, did McCarthy, or the HCUA for that matter, ever uncover and prevent or put a stop to the activities of any
actual Soviet agents? Did they do one iota for national security, or was persecuting leftists in the entertainment industry all they were good for?
As to the OP, I might add a couple of pet conspiracy theories held by the father of a former friend of mine:
The first is that
The Communist Manifesto was fabricated by British intelligence during the First World War, and that Vladimir Ilyich Ulyanov was a British agent charged with overthrowing the Tsar in order to install a new regime which would be more effective in fighting the Central Powers. My former friend's father based this belief on a seemingly anomalous Anglicism in the colofon of the "purported" first edition. Of course, that the
Manifesto was indeed first published in London, including the German-language edition, is common knowledge to anyone with a smidgen of knowledge on the subject, and contemporary (i.e. mid-19th century) sources discussing the
Manifesto are legion, meaning that there's no way it could have been fabricated from scratch in 1916, but why let historical fact get in the way of a perfectly decent CT?
The second is that the plan for the Allied landings at Salerno in 1943 was leaked to the Germans, which was why the landings were opposed. The simpler explanation is, of course, that Salerno was one of the few beaches suitable for a large-scale amphibious landing within range of fighter cover from Sicily should, and that the Germans were perfectly capable of working this out for themselves (and besides, why weren't the landings at Taranto opposed?) should, again, not be allowed to get in the way.
(I should add that one of the reasons my former friend stopped being my friend was because he didn't appreciate my pointing out the Mack truck-sized holes in his dad's conspiracy theories.)