adopt new technologies, and place emphasis on training. With this transformation, police command and control became more centralized. O.W. Wilson, a student of Vollmer, helped reduce corruption and introduce professionalism in Wichita, Kansas, and later in the Chicago Police Department. Strategies employed by O.W. Wilson included rotating officers from community to community to reduce their vulnerability to corruption, establishing of a non-partisan police board to help govern the police force, a strict merit system for promotions within the department, and an aggressive, recruiting drive with higher police salaries to attract professionally qualified officers. Despite such reforms, police agencies were led by highly autocratic leaders, and there remained a lack of respect between police and the community. During the professionalism era of policing, law enforcement agencies concentrated on dealing with felonies and other serious crime, rather than focusing on crime prevention. Following urban unrest in the 1960s, police placed more emphasis on community relations, and enacted reforms such as increased diversity in hiring. The Kansas City Preventive Patrol study in the 1970s found the reactive approach to policing to be ineffective. In the 1990s, many law enforcement agencies began to adopt community policing strategies, and others adopted problem-oriented policing. In the 1990s, CompStat was developed by the New York Police Department as an information-based system for tracking and mapping crime patterns and trends, and holding police accountable for dealing with crime problems. CompStat, and other forms of information-led policing, have since been replicated in police departments across the United States. Prisons Until the late 19th century, law enforcement in the United States was a responsibility of local and state governments only. In 1870, with the passage of the Interstate Commerce Act, the Federal government in the U.S. began to take on some law enforcement responsibilities, and the Department of Justice was established in 1870, to carry out these duties. In 1872, control of federal prisons was transferred to the new department, from the Department of Interior. New facilities were built, including the penitentiary at Leavenworth in 1895, and a facility for women located in West Virginia, at Alderson was established in 1924. See also History of law enforcement in the United Kingdom References Bibliography Primary sources Connected Histories Old Bailey Proceedings Online History of law enforcement