Former NFL Quarterback and anti-law enforcement activist Colin Kaepernick went to New York City's Rikers Island for a surprise visit with jail inmates Tuesday, angering corrections officers who say the action makes their work more dangerous.

"This will only encourage inmates to continue to attack Correction Officers at a time when we need more protection," said Elias Husamudeen, president of the Correction Officers’ Benevolent Association.

Furious union leaders noted socks Kaepernick wore in September 2016 depicting cops as little cartoon pigs in explaining their opposition, the New York Daily News reports.

"Once again, correction officers find themselves caught in Mayor de Blasio's political con-game,” Husamudeen said. “This is yet another brazen display of the hypocrisy of this mayor who pretends to support us in public, yet does everything possible to jeopardize our security in private."