This list was from timeoutboston.com, at this link:
I came across this a few days ago, and though you can argue that films such as Irreversible, Brokeback Mountain, When Dwarfs Started Small, Caligula, etc are missing, I still find it quite diverse and worthwhile.
The above link contains a good description for each film’s controversy.
Here’ the introduction:
“It’s time to get delightfully offended with these all-time shockers.
By David Fear, Joshua Rothkopf and Keith Uhlich
Warning: What follows is explicit. These movies (and their accompanying photos) are not chosen for their beauty, but rather for their primal power to shock. And why is that important? Sometimes, in the case of politics and sex, filmmakers can be liberators, leading a charge that elevates the medium’s significance. Elsewhere—especially in the case of violence—a movie can warn us of where we might be headed. These 50 entries are the extremes. We welcome your response."