Political machines are organized groups that control political parties in a specific area, often using both legal and illegal methods to maintain power. They typically provide services and support to voters in exchange for their loyalty, creating a network of influence. These machines often thrive in urban areas, where they can easily mobilize resources and people. One famous example of a political machine is the Tammany Hall in New York City, which dominated local politics in the 19th and early 20th centuries. Political machines can lead to corruption, as they may engage in practices like bribery and voter manipulation to secure elections and maintain control.