Protesters on both sides of the migrant dispute clashed outside Gracie Mansion on Sunday, as dozens of cops tried to keep the raucous crowd under control during the unprecedented crisis engulfing the Big Apple. Some of the more than 100 demonstrators screamed and threw punches at each other at the Upper East Side rally as most bashed City Hall’s handling of the crisis while others shouting them down. “No migrants on Long Island!” a Trump supporter shouted outside the Manhattan home of Mayor Eric Adams. “We pay a lot of property taxes!” Shouted another, “Americans over migrants!” Members of the...