The Associated Press reports: For generations, immigrants have shed their ancestral identities and taken new, Americanized names as they found their place in the melting pot. For Muslims in New York, that rite of assimilation is now seen by police as a possible red flag in the hunt for terrorists.

The New York Police Department monitors everyone in the city who changes his or her name, according to interviews and internal police documents obtained by The Associated Press. For those whose names sound Arabic or might be from Muslim countries, police run comprehensive background checks that include reviewing travel records, criminal histories, business licenses and immigration documents.

All this is recorded in police databases for supervisors, who review the names and select a handful of people for police to visit.

The program was conceived as a tripwire for police in the difficult hunt for homegrown terrorists, where there are no widely agreed upon warning signs. Like other NYPD intelligence programs created in the past decade, this one involved monitoring behavior protected by the First Amendment.

Since August, an Associated Press investigation has revealed a vast NYPD intelligence-collecting effort targeting Muslims following the terror attacks of September 2001. Police have conducted surveillance of entire Muslim neighborhoods, chronicling daily life including where people eat, pray and get their hair cut. Police infiltrated dozens of mosques and Muslim student groups and investigated hundreds more.

Monitoring name changes illustrates how the threat of terrorism now casts suspicion over what historically has been part of America’s story. For centuries, foreigners have changed their names in New York, often to lose any stigma attached with their surname.

The Roosevelts were once the van Rosenvelts. Fashion designer Ralph Lauren was born Ralph Lifshitz. Donald Trump’s grandfather changed the family name from Drumpf.