 Public interest legal defense funds are non-profit organizations that use legal services to advance environmentalism, animal rights, labor rights, and other public interests.They file lawsuits, provide free legal assistance to clients, push for legislative reform, and provide public education through seminars, workshops, and other outreach efforts.Public interest legal defense funds include the Earthjustice Legal Defense Fund (formerly known as the Sierra Club Legal Defense Fund), the Animal Legal Defense Fund, the Comic Book Legal Defense Fund, the National Right to Work Legal Defense Foundation, the Community Environmental Legal Defense Fund, Life Legal Defense Fund, and the National Association of Social Workers Legal Defense Fund and many others.