Justin Bieber went tagging in Colombia last night with a clear message -- GIVE CHRIS BROWN A BREAK!!!
Biebs got all Banksy in Bogota where street art is permitted... spray painting "Free Breezy" on the side of a wall.
J.B. also tagged a pro-pot message on the wall ... and paid tribute to his dead hamster Pac.
So Bieber, along with a Secret Service agent ... are doing C.B.'s bidding.
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