The election night fight club that erupted on a Brooklyn street ended up getting busted by the Big Apple sheriff’s office when the pugilists moved inside and violated pandemic gathering restrictions.

The “deathmatch” wrestling event, called a performance art by organizers, started around 9 p.m. on Frost Street in Williamsburg in front of a warehouse where about 25 people were seen gathered in a circle watching two men beat each other, a witness said.

Video of the spectacle quickly made its rounds on Twitter, catching the attention of the city sheriff’s office, which sent deputies to the scene to investigate, law enforcement sources said.

Around 12:40 a.m. Wednesday, deputies found over 50 people inside of the 17 Frost Gallery in violation of Gov. Andrew Cuomo’s executive orders on pandemic occupancy restrictions, which only allowed for 15 people to occupy the space, Sheriff Joseph Fucito told The Post.

The promoter for the event, Terrence Gallagher, insisted the deathmatch “was an art exhibit” but it didn’t matter, Fucito said.

“Deputies informed Mr. Gallagher that whether the actions were an art exhibit or an unlawful pugilistic contest not sanctioned by the State Athletic Commission, the event violated COVID-19 emergency orders and Building Department Occupancy limits due to over capacity at the location,” the sheriff said in a statement.

The spectators were cleared from the building while Gallagher, 47, was arrested and slapped with a $15,000 fine for failing to protect health and safety, Fucito said.

The promoter was charged with violation of an executive order and violation of an emergency measure and was later released from the sheriff’s custody.

The underground wrestling event featured Casanova Valentine, the “King of the No Ring Death Match,” who regularly hosts fights in Brooklyn and New Jersey.

Valentine and Gallagher didn’t immediately return a request for comment.