What tactic of holding the floor for hours on end until an unwanted piece of legislation is dropped or amended?

The tactic of holding the floor for hours on end to prevent legislation from passing is known as a "filibuster." In this parliamentary procedure, a member of the legislative body speaks for an extended period, often without yielding the floor, to delay or block a vote on a bill. This strategy is commonly used in the U.S. Senate, where it allows a minority to exert influence over the legislative process. Ultimately, the goal is to either force amendments to the bill or to compel its withdrawal.