In Action comics #900, Superman renounces his American citizenship. Entitled rightwing crybabies respond in the mature way you expect them to by vowing to never again read comics they weren’t reading anyway. Little do they know Superman, way back in 1974, already got citizenship in every country in the world, including Red China, Communist Russia, North Korea, North-Vietnam, Cuba… Scans_Daily has the whole story. Truth, Justice and the Communist Way, amirite?
(Seriously, all the fucknozzles who get their panties in a bunch about this plotline would really shit a brick if they knew what a socialist Kal-El was back in the day, slapping around profitering landlords and such.)