Making laws
expulsion
Removal of a sitting member by their own chamber, requiring a two-thirds vote. The only way Congress can remove one of its members.
In full
Article I, Section 5 lets each chamber punish its members and expel one by two-thirds. It has been used rarely, mostly for disloyalty during the Civil War and for corruption since. A chamber cannot refuse to seat a duly elected member who meets the constitutional qualifications, which the Supreme Court held in Powell v. McCormack (1969); expulsion is the available route.
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A plain-language explanation for civic education, not legal advice. When in doubt, the official source named above controls.