S portsmen ’ s Alliance Foundation filed an Amicus brief in the case of animal-rights activists suing to reverse the delisting of wolves from the Endangered Species Act throughout the Lower 48 states . Like clockwork , Defenders of Wildlife and other anti-hunting activists sued the service to overturn the delisting . The Sportsmen ’ s Alliance has been the leading advocate in litigation to defend wolf delisting decisions , such as in our Great Lakes lawsuit , which is still pending after nearly two decades , through legal petitions and comments .