ICE now uses cellphone location data to help arrest immigrants - Vox

“Even though they say it’s anonymous, when compiling different datasets together it gives you a very detailed picture of who you are, better than even you have,” Dragana Kaurin, a research fellow at the Berkman Klein Center for Internet & Society at Harvard University, told Recode. “This data can be used to discriminate against people by race, gender identity, ethnicity, sexual orientation or class,” she added, giving the example of how you could figure out someone is, say, Muslim based on their shopping at Halal markets or visiting mosques.