Forbidden Films offers fascinating clips from such notorious efforts as The Eternal Jew, Jew Suss and The Rothschilds. All were made to incite anti-Semitic passions and justify Nazi atrocities.

Of more than 1,200 films produced under the Nazi regime, to this day Germany bans about 40 it has deemed dangerous propaganda. Why that is so, and whether it does any good, is the ostensible subject of Felix Moeller's documentary.

This is a documentary fascinated with and fearful of cinema's potency, but it's also devoted to the idea of open discourse, a stance that underlines the urgency of thinking about film critically.

Cinema verboten.