1. people who work actively to achieve a particular goal, especially a political or social one
Usage: plural of campaigner

Examples

• Environmental campaigners protested outside the factory.
• The campaigners collected thousands of signatures for their petition.
• Human rights campaigners demanded justice for the victims.
• Anti-war campaigners organized a peaceful march through the city.
• The campaigners worked tirelessly to raise awareness about the issue.
• Local campaigners successfully prevented the demolition of the historic building.