In political systems, a "whip" is not a thing, but a person. Often one of the highest positions within a legislative or parliamentarian body (depending on the form of government), the whip is an assistant to a political party
Roles: House Speaker, President Of The Senate, Majority, Minority
Party leaders of the United States Senate - Wikipedia
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What Is the Whip? - Constitution of the United States
About the Legislative Branch of U.S. Government