If you loved Secrets Behind the Wall, try Red Army/PFLP: Declaration of World War
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
What they share
Both films are directed by Kōji Wakamatsu, and they both carry the outsider mood tag. If that's the register that drew you to Secrets Behind the Wall, the second film will land in a comparable space — through a different lens.
outsider
What Red Army/PFLP: Declaration of World War is
Hearts of Darkness without the flop sweat. Two directors meet members of the Japanese Red Army Faction and the Popular Front for the Liberation of Palestine in Lebanon. The result is a newsreel intended to promote Palestinian resistance. A raw document of radical politics.

