A coalition of more than 125 groups led by the American Civil Liberties Union is seeking a Justice Department probe of the New York City Police Department’s spying on Muslim communities. The NYPD’s “Demographics Unit,” as it was known until 2010, has secretly infiltrated Muslim student groups, sent informants into mosques, eavesdropped on conversations in restaurants, barber shops and gyms, and built a vast database of information. The program was established with help from the CIA, which is barred from domestic spying. In a letter, the coalition says: “The NYPD’s biased policing practices hurt not only Muslims, but all communities who rightfully expect that law enforcement will serve and protect America’s diverse population equally, without discrimination.”