The Conformist (Bernado Bertolucci, Italy, 1970)

theconformist
The brilliant mix of ideas, the audacity and originality of approach, the sensualist delight in the ravishing play of light and shadow - all these remain, as bracing and inspirational as ever.
— Washington Post

An upper-class Italian man becomes a stooge for Mussolini when he agrees to assassinate his old teacher, now an anti-fascist political dissident living in exile in Paris.