Newsweek kind of fucking up the lede here but:
Under Mamdani’s directive, city agencies are required to safeguard personal information and limit cooperation with federal immigration authorities.
This latest executive order, Mamdani’s 13th since taking office, prohibits sharing information collected for city purposes with federal authorities except when required by law. Each agency has 14 days to appoint a privacy officer and take other steps to ensure compliance.
The order directs the New York Police Department, Department of Correction, Department of Probation, Administration for Children’s Services and Department of Social Services to audit their internal policies on interactions with federal immigration authorities and make any necessary changes public. It also bars ICE agents from entering city-controlled properties such as schools, hospitals, shelters and parking facilities without a judicial warrant.


It’s a law saying these agencies need to audit their internal operations and document any murders they may have forgotten to report.
Because of the slapdash way these agencies often function, they’ll do the crime first and then build the justification after the fact.
Raising bureaucratic hurdles for police operations means increasing the risk that their bullshit won’t fly.