Greens are members of the peace movement and/or the ecology movement, and/or the feminist movement, and who support some or all of goals of a Green Party without necessarily working with or voting for that or any party.
A small sample of the factions or tendencies that exist on the movement's fringe:
Pacifist Greens are those who reject violence entirely, even that done by laws and votes, and do not generally support even simple Electoral Reform. They may support an NGO such as Greenpeace, or more radical groups engaged in destruction of property that propagates violence.
Wild Greens are a youth movement of New Zealand Greens, committed to direct action and taking bodily risks to protect nature.
Soylent Greens are more nihilistic, and employ reverse psychology for purposes of culture jamming. They often alternate wild and urban modes - and are generally very secretive. They also accept the label Terrists.