Amnesty international: FREEDOM

Amnesty International is a non-governmental organisation focused on human rights with over 3 million members and supporters around the world. The objective of the organisation is "to conduct research and generate action to prevent and end grave abuses of human rights, and to demand justice for those whose rights have been violated." It works to mobilise public opinion to put pressure on governments that let abuse take place.
AI does not judge whether recourse to violence is justified or not. However, AI does not oppose the political use of violence in itself since The Universal Declaration of Human Rights, in its preamble, foresees situations in which people could "be compelled to have recourse, as a last resort, to rebellion against tyranny and oppression".