Flock, a surveillance company, has installed more than 100,000 license plate reader cameras across the United States, sparking growing privacy concerns.

Opponents say the cameras create a massive database that can track vehicles and share information across jurisdictions, raising concerns about civil liberties and potential government abuse.

The controversy has fueled a grassroots anti-Flock movement, with some activists vandalizing cameras and others organizing online campaigns against the technology.

Critics point to cases of police allegedly misusing the system to monitor romantic partners, women who had abortions and immigrants, while law enforcement says the cameras help solve serious crimes, the AFP has reported.

The movement has gained support across political lines, and more than 70 municipalities have reportedly ended their contracts with Flock in recent months.