List of United States senators expelled or censured

The United States Constitution gives the Senate the power to expel any member by a two-thirds vote. This is distinct from the power over impeachment trials and convictions that the Senate has over executive and judicial federal officials: the Senate ruled in 1798 that senators could not be impeached, but only expelled, while debating the impeachment trial of William Blount, who had already been expelled.

Source: Wikipedia — List of United States senators expelled or censured (CC BY-SA 4.0)