Günter Wallraff: Lowest of the Low (1986)

Wallraff hid for two years as Ali Levent Sinirloglu, working various jobs as a Turk. His experiences were shocking, and he documented them with a video camera, aided by director Jörg Gfrörer. The footage, along with additional recordings, was edited into a 106-minute film from about 100 hours of material.