The New York City police department’s disciplinary issues are coming to a head during the third year of tough-on-crime Mayor Eric Adams’s administration, with complaints at their highest since 2012, stop-and-frisk encounters soaring and displays of impunity by rank-and-file officers, according to interviews and data from the city’s independent police watchdog agency. Disciplinary records and interviews with sources also reveal a persistent problem with instances of NYPD officers wearing morale patches on their bulletproof vests containing possible white supremacist imagery. This is an uncomfortable echo of four years ago, when the NYPD’s riot squad pummeled protesters and cops openly wore...