When living in the USA in the second half of the 70s, not only did I have to prove that I didn’t have TB (X-ray), wasn’t a member of any Communist party, but that every January I had to register myself as an alien. A concept I always found strange, having absorbed many sci fi books and films. (We, citizens of the USA are just fine, the rest of you are aliens.)
Photo taken in San Francisco one January wearing my second head on my way to prove I was an alien and yes they believed me. After five years I returned to the human race.
Citizen Cane picks up his camera 