City Councilman Jumaane Williams had no right to block an ambulance transporting an immigration-rights activist who just learned he was being deported, Manhattan prosecutors told jurors Wednesday.

”The right to protest is not one without limitations in that it cannot come at the expense of the safety or security of other New Yorkers,” ADA Ryan Hayward said in opening statements at the misdemeanor obstruction trial.

Williams, who is running for Lt. governor, repeatedly stood in front of the ambulance, carrying activist Ravi Ragbir, who had just fainted after learning he was going to be deported.

On Jan. 11, Ragbir checked in with US Immigration and Custom’s Enforcement, as he had done for a decade, when an agent arrested him.

Williams, 41, and dozens of other protesters surrounded the ambulance creating “gridlock that would impress even the most hardened New Yorker,” Hayward said.

Despite being told to move, Williams crouched in front of the ambulance as a trombonist and saxophonist played in the background, the prosecutor said.

“It was mayhem on the street,” the ADA added, as Ragbir watched from the gallery in Manhattan Criminal Court.

The fed-up cops arrested 18 protesters, but Williams is the only one who took his case to trial.

The others took dismissal deals.

Defense lawyer Rhiya Trivedi countered that Williams did everything humanly possible “to stop the ambulance turned deportation machine” because Ragbi was a dear friend, who was being deported illegally.

She said cops were choking and manhandling protesters but that he acted peacefully in the face of “police brutality.”

A month after the demonstration, the feds issued a temporary stay of deportation for Ragbir.

The Trinidad native was convicted of wire fraud in 2000, prompting a 2006 deportation order, which he has been fighting since.

Williams, whose lawyer said he’ll testify, faces up to one year in prison.