A bloc party (German: Blockpartei) in politics may refer to a political party that is a constituent member of an electoral bloc. However, this term also has a more specific meaning, referring to non-ruling but legal political parties in an authoritarian or totalitarian regime (most notably communist regimes) as auxiliary parties and members of a ruling coalition, differing such governments from pure one-party states such as Nazi Germany and the Soviet Union, although such minor parties rarely if ever constitute opposition parties or alternative sources of power.
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Sometimes, a bloc party is called a satellite party.