When J. Edgar Hoover became head of the Bureau of Investigation in 1924, he laid the groundwork for a strategy that would make the FBI one of the most prestigious police organizations in the world. The public’s opinion of detectives was ready for change. Inspired by detective-heroes in the novels and short stories of Charles Dickens, Edgar Allan Poe, and Sir Arthur Conan Doyle, readers developed a new interest in real-life accounts of detectives’ exploits. Hoover set out to make the fictional image of the detective into reality. He eliminated corruption by suspending bureau investigations requiring considerable undercover or investigative work (e.g., vice and, later, organized crime) and by creating a strong bureaucracy that emphasized accountability. He also established educational requirements for new agents and a formal training course in modern policing methods. In 1935 he created the FBI National Academy (originally the Police Training School), which trained local police managers. The academy extended the influence of the FBI—and of Hoover himself—over local police departments while at the same time contributing to the exchange of professional expertise. Hoover concentrated the bureau’s resources on crimes that received great publicity and were relatively easy to solve, such as bank robberies and kidnappings, and he assiduously cultivated the public image of the “G-Man” (the “government man”) as the country’s incorruptible crime fighter. The national academy, its scientific crime laboratory (created in 1932), and the Uniform Crime Reports compiled by the bureau were critical factors in establishing crime fighting as the primary mission of police forces in the United States.

As a result of Hoover’s changes, Vollmer’s idealistic vision of police work, with its strong emphasis on social work, was replaced with Hoover’s strategy. Instead of broadening police responsibilities as Vollmer had proposed, the new reformers narrowed them to concentrate on fighting serious street crimes. They also moved to sever the close ties between officers and neighborhoods. Assignments were changed often; officers no longer patrolled areas in which they lived; and, most important, the police began to patrol in automobiles. To insulate police from political influence, civil-service systems were created to hire and promote officers. The basic source of police authority was changed from law and politics to law only (especially criminal law). Finally, administrative decentralization was abandoned in favor of centralized citywide bureaucracies characterized by standardized operating and training procedures and minimal discretion at all levels, a strict division of labor (usually into separate divisions responsible for patrolling, investigating, and providing support services), and a military-style command and control structure. The basic strategy of policing shifted to what became known as the “three Rs”: random preventive patrols, rapid response to calls for service, and reactive criminal investigation. That model came to dominate policing in the United States. After World Wars I and II, as American political influence grew, the model was adopted in other countries.

The full motorization of the American police was largely accomplished after World War II, when the automobile became a more important part of American life. The rationale for using automobiles in preventive patrols was manifold. The random and rapid movement of police cars through city streets would create a feeling of police omnipresence that would deter potential criminals and reassure citizens of their safety. Rapidly patrolling police also would be able to spot and intercept crimes in progress. The use of radios in police cars increased the value of automobile patrols, because it enabled rapid responses to calls for assistance. Police throughout the United States set an optimum goal to arrive at the scene of a crime within three minutes of an initial report.

Ironically, Wilson, Vollmer’s protégé, became the architect of the new crime-fighting model. As chief of police in Fullerton, Calif., and Wichita, Kan. (1928–39), professor and dean of the School of Criminology at the University of California, Berkeley (1939–60), and superintendent of the Chicago Police Department (1960–67), he supported the development of crime-focused police departments and specifically the use of motorized patrol units and radio communication systems. Wilson’s Police Administration (1950) was for many years considered the bible of American policing.

Wilson’s strategy of policing came to fruition during the 1960s. Indeed, in 1967 the President’s Commission on Law Enforcement and Administration of Justice, which was critical of the strategies of other criminal justice agencies, endorsed both preventive patrols and rapid responses to calls. The commission concluded that the basic strategy of policing was satisfactory and that improvement would come as a result of fine-tuning police organizations, equipment, and personnel. The commission noted that preventive patrols elicited hostility from some communities, especially those of ethnic minorities, but argued that the patrols’ anticrime potential was so great that they had to be maintained. Police community-relations programs were proposed to offset the negative results of preventive patrols.

Despite its initial promise, the professional crime-fighting model of policing had many drawbacks. The strategies of motorized preventive patrols, rapid responses to calls, and emergency on-demand systems (such as the 911 system in the United States) resulted in the creation of “incident-driven” patrol units whose dominant task in many cities was responding to calls for service. The responsibility of citizens for crime prevention was thus reduced to that of an activator of police services. In addition, the complete motorization of police patrols isolated officers from the communities and citizens they served. Police interacted with citizens primarily in situations where a crime had been committed (or alleged) and officers were expected to take some action to enforce the law. Those often negative encounters tended to increase hostility between police and citizens, especially in minority communities, and to reinforce negative stereotypes on both sides. Finally, under the professional model, police departments tended to become inflexible and more concerned with their own needs than with those of the communities they served.

Meanwhile, in Britain, Peel’s police strategy enjoyed success during the 20th century. Foot patrols continued in most cities, which lacked the suburban “sprawl” of American cities. Although “fire brigade” policing, as many British characterized the rapid-response orientation of American police, had some influence in Britain, it was counterbalanced by the continued emphasis on the neighborhood bobby.

The crisis of policing

In the 1960s and ’70s, policing in the United States underwent a crisis. Crime continued to rise despite massive financial outlays for more officers. From 1963 to 1968 hundreds of urban riots and violent demonstrations occurred. The depth of hostility that minority groups, especially African Americans, felt toward police surfaced during those disturbances. African Americans resented the sometimes harsh tactics used by police, and many believed that the police themselves were often the original cause of the violence. Meanwhile, police arrests and beatings of participants in civil rights and antiwar demonstrations—some of which were broadcast live on national television—were widely condemned. In 1967 Pres. Lyndon Johnson created a national commission to study the causes of urban riots in the country. The commission, finding that the ultimate cause was racism, concluded in a famous passage that the United States was “moving toward two societies, one black, one white—separate and unequal.” It also found that police tactics, such as the unwarranted use of deadly force, often made the riots worse. Yet, despite the violence in such cities as Los Angeles, Chicago, New York City, and Detroit, it can fairly be said that during this period the fear of crime escalated more rapidly than crime itself. Many citizens took measures to defend themselves and their homes and stayed away from parks and other public facilities; many even fled the cities completely.

In the late 20th century, urban rioting in ethnic minority communities was also a serious problem in Britain. The Scarman Report (1981), which resulted from an official inquiry into rioting in the Brixton neighborhood of London, concluded that police had become too remote from their communities, that local citizens should have more input into police policy making, and that police tactics should be more sensitive to the growing cultural pluralism of Britain’s major cities. At the same time, the report endorsed the traditional view that the primary duty of the police is to maintain public order. Nevertheless, periodic rioting continued to plague such cities as Bristol, Birmingham, and Bradford in the last decades of the 20th century.

In response to the crisis in policing, several significant research studies were undertaken. In the 1950s and ’60s, both civilian and police groups assumed that the primary activity of police officers was fighting crime (e.g., by making arrests)—and that crime fighting by police involved little discretion. New research on how police actually functioned, however, revealed that crime fighting constituted less than one-fifth of patrol activities. The remainder included resolving conflicts, providing emergency and other public services, and maintaining order. Often citizens called on the police to perform a variety of functions not specified in the law or in police department manuals and procedures. Moreover, it was discovered that police officers regularly used discretion in handling events, criminal or otherwise, and that the use of discretion was an essential ingredient of policing.

American studies of the effectiveness of preventive automobile patrols found that, despite the commitment of substantial amounts of police time, relatively little crime-fighting activity resulted directly from police patrols. More than nine-tenths of arrests, for example, resulted from citizens’ requests for police action. Later studies, such as one in Kansas City, Missouri, in the mid-1970s, found that preventive patrols by automobile did not effectively reduce crime, increase public satisfaction with police, or decrease citizens’ fear of crime. Moreover, during the late 1970s several studies on the efficacy of rapid response to calls for service found that it had little impact on crime prevention or criminal apprehension and that alternative approaches might produce greater levels of citizen satisfaction. Such findings led to an increased questioning of the professional crime-fighting model of policing and helped to usher in a period of unprecedented experimentation and openness to change.