Filmmaker Mary Fishman discusses her documentary “Band of Sisters,” the story of two nuns who advocate for the rights of immigrant detainees and deportees in and around a Chicago-area deportation center. The film follows sisters who continue their mission as organic farmers, environmental attorneys, peace activists, holistic health care practitioners, and more, even in the face of obstacles and threats cast by government agencies, the military, and the hierarchy of the Catholic church. It’s playing at Cinema Village.