China's Ministry of State Security is the world's largest and most active spy agency — and it's targeting the U.S.

China is intent on using spies to monitor and influence events outside its own borders. 60 Minutes reports on why China's spies are on the rise, and what happens when one gets caught in the U.S.

The largest spy agency in the world is now in China, with the U.S. its second-biggest target. The first? China's own people – ...