The ARC spearheads and supports campaigns that protect the environment, human rights and social justice.  It also provides resources, training and coordination for organizations and activists.  They work to protest old growth forests, corporate withdrawal from Burma, and opposing oil development on the traditional lands of Columbia's U'wa people.  They have monthly
meetings in Venice, CA. They are  nonviolent and perform things such as protests.
It is a big website that is well organized.  It even has a virtual reality tour page.