This is probably a pretty random question, but why are there Portuguese subtitles? Why would people in Portuguese-speaking countries really give a crap about communists undermining the United States?
I can answer that!
Apparently it's from a right-wing commie-hating group in Brazil, Direita Realista, which translates to something like The Realistic Right (right as in "right-wing", not as in "human rights"). My guess-translation* of the video description behind the spoiler
A documentary that shows evidence of cultural subversion, its agents and tactics to destroy American society from the inside, its values and morals, to justify the presence of a totalitarian socialist government.
Shows links since Karl Marx with radical revolutionary movements like feminism, environmentalism, the gay movement, etc, Marxist authors like Gramsci, the Fabian Society, etc all the way to Obama.
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Shows the targets, and why they are attacked, and the tools, and why they are used.
Serves perfectly for other countries fighting against cultural Marxism, like Brazil.
Apologies for the awkward grammar.
*I don't speak Portuguese, I'm relying on the similarity between romance languages, plus a bit of Google Translate.