Partisan

noun
  1. A strong supporter of a party, cause, or person. noun
    She was a partisan of the environmental movement, always advocating for sustainable practices.
    The newspaper was criticized for its partisan reporting, favoring one political party over others.
  2. Prejudiced in favor of a particular cause; biased. adjective
    The judge was accused of making a partisan decision that favored one side unfairly.
    His partisan views made it difficult for him to consider alternative perspectives.
  3. A member of an armed group formed to fight secretly against an occupying force, especially in a country occupied by a foreign power. noun
    During the war, partisans conducted guerrilla warfare against the occupying forces.
    The partisans played a crucial role in disrupting enemy supply lines.