History
Baron Zemo disguised the Masters of Evil as the heroes of the Thunderbolts. He himself took on the mantle of Citizen V. Later, when they were discovered, they were attacked by the Avengers, Zemo took on an old enemy of Captain America, but due to Hawkeye and Meteorite romantic affinity, the battle ceased. Hawkeye decided to become the new leader of the team in order to make the Thunderbolts real heroes, and Zemo was expelled from his position as leader due to his villainous nature.