Wikipedia gives this account of the impeachment of US Supreme Court Justice Samuel Chase:

“Virginia Congressman John Randolph of Roanoke took up the challenge and took charge of the impeachment. The House of Representatives served Chase with eight articles of impeachment in late 1804, one of which involved Chase’s handling of the trial of John Fries. Two more focused on his conduct in the political libel trial of James Callender. One article covered Chase’s conduct with the New Castle grand jury, charging that he “did descend from the dignity of a judge and stoop to the level of an informer by refusing to discharge the grand jury, although entreated by several of the said jury so to do.” Three articles focused on procedural errors made during Chase’s adjudication of various matters, and an eighth was directed at his “intemperate and inflammatory … peculiarly indecent and unbecoming … highly unwarrantable … highly indecent” remarks while “charging” or authorizing a Baltimore grand jury. The Jeffersonian Democratic-Republicans controlled United States Senate began the impeachment trial of Chase in early 1805, with Vice President Aaron Burr presiding and Randolph leading the prosecution.

All the counts involved Chase’s work as a trial judge in lower circuit courts. (In that era, Supreme Court justices had the added duty of serving as individuals on circuit courts, a practice that was ended in the late 19th century.) The heart of the allegations was that political bias had led Chase to treat defendants and their counsel in a blatantly unfair manner. Chase’s defense lawyers called the prosecution a political effort by his Republican enemies. In answer to the articles of impeachment, Chase argued that all of his actions had been motivated by adherence to precedent, judicial duty to restrain advocates from improper statements of law, and considerations of judicial efficiency.

The Senate voted to acquit Chase of all charges on March 1, 1805. “