Officials Stifle Free Speech, Writer Says Editor: I Am Going To Do A Series Of Letters On Gang Activity In The Hazleton Area School District. These Letters Will Not Be About Students, But Will Be About The Gang That Is Headquartered In The Building Known As ``the Bunker.'' This Gang Appears To Be Motivated By Greed And Power With The Notable Exception Of Its Leader, Superintendent Geraldine Shepperson. In Dr. Shepperson's Case, The