REBEL

[noun] [C] - a person who is opposed to the political system in their country and tries to change it using force, or a person who shows their disagreement with the ideas of people in authority or of society by behaving differentlyThe prime minister left the capital after learning that the rebels were planning an imminent attack.Rebel forces have taken over the capital and set up a new government.She has successfully led a rebel backbench campaign against the government's education bill.He was a bit of a rebel when he was a teenager and dyed his hair pink and had his nose pierced.