factional struggles
definitions
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Conflicts or power battles occurring within a larger organization, political party, or group between different subgroups (factions) that have opposing interests, goals, or ideologies.ru: Фракционные борьбы
examples
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The political party was weakened by constant factional struggles over leadership.
Политическая партия ослабла из-за постоянной фракционной борьбы за лидерство.