In March 2020, Frank van der Linde entered the immigration line for European Union citizens at Amsterdam’s Schiphol international airport. Linde, a Dutch citizen and human rights advocate, was returning home from outside the EU, and the immigration officer asked him a series of questions about his trip. Linde thought it was a random check; after a few minutes, he was cleared for entry. But unbeknownst to Linde, his answers were recorded and shared with a Dutch public prosecutor, who was collecti...