The US political system is intentionally designed to insulate the Federal government from ephemeral fluctuations in public opinion, with election cycles giving the people a chance to have their say in the longer term. On several issues there is a noticable gap between what politicians would like to do and what the public will support. I was wondering, what are the contenders for the most undemocratic, unpopular actions ever imposed at least temporarily on the public? When either the President or a voting majority of Congress effectively said “to hell with what the Great Unwashed think, we’re passing this!”
ETA: Since the Supreme Court isn’t elected, controversial Court decisions like Roe V. Wade are excepted.
PPS. Prohibition was widely popular when it was passed. It just didn’t stay that way.