The New York Police Department said that a "number of individuals" refused to present their proof of vaccination upon arrival at the Italian food chain, according to the New York Post.
Most of the protesters eventually left the restaurant in the heart of New York City but three men and a woman refused to comply. They are expected to be charged with trespassing, the daily said.
New York City mandated in August that visitors present proof of vaccination against the new coronavirus to enter such indoor businesses as restaurants, entertainment venues and gyms.