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American tech giants sold surveillance technology to China, enabling mass detention campaigns targeting hundreds of thousands of citizens.

U.S.-built systems helped track every movement, message, and purchase of some within China.

Companies including IBM, Dell and Cisco marketed tools specifically for Chinese police to control citizens.

The body camera hung from the top of the IV drip, recording the slightest twitch made by Yang Guoliang as he lay bloody and paralyzed in a hospital bed after a police beating with bricks.

By then, surveillance was nothing new for the Yang family in rural China, snared in an intricate network based on U.S. technology that spies on them and predicts wha

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