Nonviolent resistance to injustice. More than 250 forms of nonviolent direct action have been identified, including marches, boycotts, picketing, sit-ins and prayer vigils, to name a few. See Six steps of nonviolence.
Any crime that causes economic or physical damage to a business or individual targeted by violent animal rights activists or eco-terrorists. Examples include spray-paint vandalism, breaking-and-entering, theft of animals, and arson.
Those tactics that can be undertaken by people themselves, without the help of government agencies, lawyers, or other institutions. Examples include picketing, work slowdowns, strikes, occupation of buildings, and marches.
Civil disobedience, guerrilla street theater, picketing, protest marches, road blockades, demonstrations, and other techniques borrowed from the civil rights movement and applied to environmental protection.