That would be the latter - Churches of Christ
I did a double take when I read your question - I thought you wrote "cannabalism!" :)
(actually, accusations of cannabalism are a slur against Christians who take Jesus' "Lord's Supper" teaching literally)
Oops, learn to spell cannibalism, Bruck!
Each congregation is ruled by its own elders, ostensibly without influence from a denominational "headquarters".
I'm proud to be a member thereof.
HF