The anti-crime units had absorbed the remnants of the city’s plainclothes Street Crime Unit, which had begun three decades earlier.
The Street Crime Unit was disbanded by Commissioner Raymond W. Kelly in 2002 after years of simmering criticism over the 1999 shooting of Amadou Diallo. Plainclothes officers had shot Mr. Diallo, a street vendor, 41 times after mistaking his wallet for a gun. Mr. Kelly reassigned the remaining Street Crime officers to various anti-crime units across the city.
Though the anti-crime officers account for only about 2 percent of the department’s uniformed force, they have been involved in a disproportionate number of shootings by the police.
A 2018 review of fatal police shootings in New York City conducted by The Intercept, an online publication, found that plainclothes anti-crime officers had been involved in 31 percent of the incidents since 2000.
In 2006, two plainclothes detectives with an anti-crime unit shot and killed Sean Bell, a 23-year-old black man, on what would have been his wedding day, just as he was leaving a bachelor party.
One of the detectives involved in the incident was fired by the department, and three other officers were forced to retire. The city eventually settled a federal lawsuit and agreed to pay $7 million to Mr. Bell’s family and two of his friends.
In 2018, anti-crime officers shot and killed Saheed Vassall, a mentally ill man who pointed a metal pipe toward them like a gun on a busy Brooklyn street. Mr. Vassall, 34, was known as an idiosyncratic fixture in the neighborhood, and patrol officers were familiar with the man’s bizarre antics. The anti-crime officers who responded however, were part of a team that did not routinely work in the area and did not know Mr. Vassall.