Former Boston Police Commissioner William Gross is stepping up to the plate for North End restauranteurs.

He’s headlining a rally Friday at the Paul Revere Mall on Hanover Street at 3 p.m.

The Herald has learned part of that rally will be a poster that will be passed around urging those who disagree with the crackdown on outdoor dining in the North End to call the mayor’s 311 “with reservations.”

A group of restaurant owners say they have been unfairly targeted by Mayor Michelle Wu for banning on-street dining in the North End, limiting the al fresco option to “compliant sidewalk patios.” Out of Boston’s 23 neighborhoods, the North End is the only one to encounter the restrictions.

North End restaurant owners say the neighborhood is being “punished” and missing out on business because of the outdoor dining restrictions. A group of 21 neighborhood restaurateurs and the North End Chamber of Commerce have filed a lawsuit in federal court, demanding the city refund the losses their businesses have sustained.