Dude,
The evidence is documentary evidence in hard copy and computer files taken from Ayman Zawahiri’s computer, the computer of KSM’s assistant etc. and relates to the announced intention and steps taken to recruit scientists to weaponize anthrax and infiltrate the UK and US biodefense establishments.
Neither Ayman nor KSM are communist.
The documentary evidence shows that they intended to use the cover of universities and charities, which they did.
The Postal employee of relevance was Salafist, like Bin Laden and Ayman. He was the blind sheik’s chief aide. He was working directly with the Islamic Group head and military commander, and even the founder of EIJ. None of them are communist.
So check under your bed for commies, but leave them out of true crime analysis of the anthrax crimes.
Besides, we commies like to think of ourselves “60s activists” or “antiwar activists.”
Yes, the attackers were Salafists. The “cover up”, though, was undertaken to protect American Commies “just in case”.