With little warning or regulation, companies are increasingly using facial recognition technology on their customers — as a security measure, they say.

But what happens when the systems are actually being used to punish the companies’ enemies?

Guest: Kashmir Hill, a technology reporter for The New York Times. 

Background reading: 

• Madison Square Garden Entertainment, the owner of the arena, has put lawyers who represent people suing it on an “exclusion list” to keep them out of concerts and sporting events.
• Some have undermined the company’s ban by using a law passed in 1941 to protect theater critics.

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