Though the release date says 1956, this film consists mostly of footage from a 1931 documentary called "Gow the Killer." It was the first sound film to deal with cannibalism, as it documented the social life and customs of primitive tribes that in fact did engage in cannibalism.
Gow
Self

Mondo Topless
Mondo Topless

Faces of Death
Faces of Death

Ensuring Your Place In Hell Vol. III
Ensuring Your Place In Hell Vol. III

Ensuring Your Place In Hell Vol. II
Ensuring Your Place In Hell Vol. II

90 Nights Around the World
90 Nights Around the World

42nd Street Forever, Volume 5: Alamo Drafthouse Cinema
42nd Street Forever, Volume 5: Alamo Drafthouse Cinema

FUBAR Vol. 1
FUBAR Vol. 1

The Gig Is Up
The Gig Is Up

The Last Confession of Alexander Pearce
The Last Confession of Alexander Pearce

Clawing! A Journey Through the Spanish Horror
Clawing! A Journey Through the Spanish Horror

Blood of 1000 Virgins
Blood of 1000 Virgins

Cannibals Tomorrow
Cannibals Tomorrow