A drug-law reform activist spent a night in jail after hurling abuse at cops in an attempt to stop them from collaring pot-smokers outside his Greenwich Village home, police said.

As undercover cops nabbed the two dopers Thursday night, Randy Credico allegedly burst from his Gay Street home and screamed, "You guys are really solving murders out here? Why don't you guys get a life! F- - - you all! You can't tell me what to do!"

Credico admitted to The Post he was trying to prevent the arrest of the teens.

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