Answer
The policy of New York City that prompted Linda Sarsour's activism was the stop-and-frisk tactic employed by the New York Police Department (NYPD). Sarsour, a prominent Palestinian-American activist, became involved in community organizing and social justice advocacy in response to the disproportionate targeting and harassment of Muslim and Black individuals by the NYPD. She played a crucial role in mobilizing communities and raising awareness about the discriminatory practice.