Mehdi Karroubi is an Iranian Shia cleric and reformist politician leading the National Trust Party. Following 2009–2010 Iranian election protests, Karroubi was put under house arrest in February 2011 – reportedly ordered by the Supreme Leader of Iran – without officially being charged, although he is accused of being a "seditionist" and "traitor". As of 2021, he is still confined to his house.

The Reformists are a political faction in Iran. Iran's "reform era" is sometimes said to have lasted from 1997 to 2005—the length of President Mohammad Khatami's two terms in office. The Council for Coordinating the Reforms Front is the main umbrella organization and coalition within the movement; however, there are reformist groups not aligned with the council, such as the Reformists Front.