cannibalism

n. act of eating human flesh

Cannibalism (from Spanish , in connection with alleged cannibalism among the Caribs), also called anthropophagy (from Greek  "man" and "to consume") is the act or practice of humans consuming other humans. In zoology, the term cannibalism is extended to refer to any species consuming members of its own kind.
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(n.)
The act or practice of eating human flesh by mankind. Hence; Murderous cruelty; barbarity.
  

Noun
1. the practice of eating the flesh of your own kind
(hypernym) practice, pattern