This series contains a small amount of incoming and outgoing professional correspondence with various individuals, including memoranda written by Gruenberg to his city editor at the Chicago Daily News regarding various leads and stories, exhortations to other Daily News personnel describing what Gruenberg felt the newspaper could and should be, and memorandums regarding his work for the National Education Association. Also included are some personal materials: newspaper clippings regarding Gruenberg, memorabilia, and some biographical material.