How has Congress used the power of impeachment in checking the judiciary? Is it a viable way to reign in “activist” judges?

What will be an ideal response?

Although Congress has threatened impeachment for various reasons, it has only removed judges from office for unethical and illegal acts, not for unpopular legal or policy decisions. Impeachment has been rarely used throughout U.S. history. Although this power could in theory be used to discipline “activism” and remove judges who make unpopular rulings, this has not historically been a practice of Congress and would probably put members at electoral risk since people perceive value in an independent judiciary.