Agents use facial recognition, social media monitoring and other tech tools not only to identify undocumented immigrants but also to track protesters, current and former officials said.
On the morning of Jan. 10, Nicole Cleland was in her car trailing an Immigration and Customs Enforcement agent through Richfield, Minn., her hometown.
Suddenly, the agent turned into a series of one-way streets and stopped, getting out of his white Dodge Ram, said Ms. Cleland, who volunteers with a local watchdog group that observes the activity of immigration officers. The agent then walked over to Ms. Cleland’s car and surprised her by addressing her as Nicole.
