Beijing is now punishing Taiwanese people for legal activities done in Taiwan, a warning sign for anyone traveling to China.

• A young Taiwanese who once worked for Amnesty International was pulled aside at Shanghai immigration and questioned for six hours, then gave up entry and flew home.
• China's Taiwan Affairs Office confirmed the case and called screening of people tied to "anti-China organizations" fully legal.
• Taiwan's Mainland Affairs Council says the point is fear itself — making every person carry a little secret police officer in their head so they avoid joining groups or signing petitions.
• Volunteering for Amnesty is normal and even earns school credit in Taiwan, the same as Greenpeace or World Vision, yet China treats it as grounds for interrogation.
• Amnesty helped Taiwanese dissidents during the martial law era, including Peng Ming-min and figures from the Kaohsiung Incident, so Taipei rejects the claim that the group is anti-China rather than anti-Communist Party.

Outlook: Expect more warnings from Taipei about travel to China, and more Taiwanese thinking twice before joining rights groups.