“Maggie Growls” is a warm profile of feisty Gray Panthers founder Maggie Kuhn (1905-95), who described herself (on her deathbed) as “an advocate of justice and peace.” Those words were perhaps her quietest. Kuhn was forced to retire from her social-service post with the Presbyterian Church in 1970, but, says Ralph Nader, “she felt she was just getting started,” and the Panthers followed. Kuhn's activism is recalled here in clips, interviews and animation. As she said of the Panthers (quoted by her biographer, Christina Long): “We are action oriented. We are radical.” Angela Bassett introduces the film.