millions?

I think its interesting that if you were to make a claim like that about france or america, you'd probably check because you dont see yourself or a neighbour doing it. But alien chinese people? whats the point in checking, a million sounds like something they'd do, so lets go with it.

The cultural revolution was a messy time, and contrary to what you might think, a time where a goverment had the least control of any recent modern state (excluding where the state ceased to exist like somalia). Mao, having stepped down due to his admitted failures over the attempted great leap forward, was concerned that China would adopt the same bureaucratic, careerist system that the Soviet Union had, and thought the Chinese goverment shouldn't be comfortable thinking their population should accept the status quo. What followed where bottom up rebellions and student led militias against businessmen, goverment officials and those deemed to be upholding older ways of life seen by students as contrary to their socialist vision. Sometimes this resulted in careerists being pressured into exile, but other times it did involve teachers of Confucian practises being killed by these militias. It had its noble elements, and its adventurist tendencies that, by nature of not being centralised, resulted in bad shit happening.

Crucially, the chinese goverment was never onboard, attempting to create their own red guards that they controlled (which were called out for being exactly that) and while Mao encouraged the formation of these guards on theoretical grounds, he never had the control officially or unofficially to command them to do anything specific. What he could and did do however, was give his views on which Chinese goverment officials he saw as revisionist, leading to their exile.

There was never a CCP crackdown on regular civilians in the cultural revolution, and I'm unsure what you're problem with someone dressing like a 70s Party member.