Title of a 70s shocking documentary about USA?

When I was a kid, growing up in then liberal communist Yugoslavia of late 70s, I saw a shocking movie documentary about pretty weird side of America. I don’t remember all stories included but two: homeless rat-eating people living in underground labyrints of NewYork, and a happy middle-class family eating live earthworms. The movie title was America… something (or “This is America too”) and I think there was a sequel to it.
Does anyone know the exact title?

I recall that this movie was reviewed on a very interesting site called The Unknown Movies. The title is This Is America, and mostly involves (based on the review) bizzare sexual practices, plus hot dogs and clown churches for good measure.

Thank you mobo85! That is the exact title!
But the one I remember was the sequel to it - short review found here

“THIS IS AMERICA PART 2 (Questa e’ L’America Parte II; Das Ist Amerika 2) 1977 [B-] Even more wild than part one! Includes Jello Biafra, a cocaine church, a family of worm eaters, a topless car wash and so much more. This UNCUT english language print runs longer than the Italian version.”