sub-ranked as "do-pops" and "rankers". In past eras, trustee prisoners were responsible for the prison's perimeter security. During the day, the prison barracks were empty since most prisoners worked on the fields. At night, the two free world employees patrolled the central corridor but did not venture into the barrack units. The trustees, armed with knives, kept the order at night. Some inmates, referred to as "crawlers" and "creepers", stabbed sleeping prisoners. Male on male rape frequently occurred in the housing units. The prison did not ask trustees to intervene in case of rape, and guards rarely intervened. Prisoners did not receive payment for working in the fields. In order to buy items from the commissary, some prisoners worked there. Other prisoners sold their blood; a healthy prisoner was permitted to sell his blood once weekly. Trustees were allowed to leave and re-enter the prison without undergoing searches, so trustees smuggled in alcohol, illegal drugs, and weapons; they then sold those items within the prison. Trustees usually bought these items from one another, since they had large amounts of money. Non-trustees, including "do-pops" and "rankers", had to pay trustees in order to get food, medicine, access to medical staff, access to outsiders, and protection from arbitrary prison punishments. Therefore non-trustees did not have large reserves of money. Education in the Cummins Unit began in 1968, when the Gould School District started a night program. Wardens Thomas G. Milner (1941-1949) Terrell Don Hutto (beginning 1967) Notable inmates Death Row John Edward Swindler, sentenced to death and executed on June 18, 1990, for the murder of Patrolman Randy Basnett. Ricky Ray Rector, sentenced to death and executed on January 24, 1992, for the murder of Police Officer Robert Martin. Darryl Richley, sentenced to death and executed on August 3, 1994, for the murder of Donald Lehman. Hoyt Franklin Clines, sentenced to death and executed on August 3, 1994, for the murder of Donald Lehman. James William Holmes, sentenced to death and executed on August 3, 1994, for the murder of Donald Lehman. Barry Lee Fairchild, sentenced to death and executed on August 31, 1995, for the murder of Marjorie "Greta" Mason. Marion Albert Pruett, sentenced to death and executed on April 12, 1999, for the murder of Bobbie Jean Robertson. Christina Marie Riggs, sentenced to death and executed on May 2, 2000, for murders of her two children. Charles Laverne Singleton, sentenced