It was a Blue Lives Brawl, as these dramatic photos show.

Tempers flared in Brooklyn Saturday as anti-cop protesters crashed a Blue Lives Matter rally — complete with furious finger-pointing and a lot of shouting, pushing and shoving.

Some three dozen anti-cop protesters showed up just before the 11 a.m. start of the rally at 13th Avenue and Bay Ridge Avenue in Dyker Heights.

The multi-racial group confronted a crowd of more than 300 police supporters, virtually all of them white.

Angry words flew, largely from the pro-cop contingent.

“You want to destroy America!” pro-cop protesters hollered. “You are f—ing Communists. Go to Venezuela.”

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