The notorious final film from Pier Paolo Pasolini (Mamma Roma), Salo, or the 120 Days of Sodom, has been called nauseating, shocking, depraved, pornographic . . . It’s also a masterpiece. The controversial poet, novelist, and filmmaker’s transposition of the Marquis de Sade’s eighteenth-century opus of torture and degradation to Fascist Italy in 1944 remains one of the most passionately debated films of all time, a thought-provoking inquiry into the political, social, and sexual dynamics that define the world we live in.