<P> The UCR Program was based upon work by the International Association of Chiefs of Police (IACP) and the Social Science Research Council (SSRC) throughout the 1920s to create a uniform national set of crime statistics, reliable for analysis . In 1927, the IACP created the Committee on Uniform Crime Reporting to determine statistics for national comparisons . The committee determined seven crimes fundamental to comparing crime rates: murder and non-negligent manslaughter, forcible rape, burglary, aggravated assault, larceny and motor vehicle theft (the eighth, arson, was added under a congressional directive in 1979). The early program was managed by the IACP, prior to FBI involvement, done through a monthly report . The first report in January 1930 reported data from 400 cities throughout 43 states, covering more than 20 million individuals, approximately twenty percent of the total U.S. population . </P> <P> On June 11, 1930, through IACP lobbying, the United States Congress passed legislation enacting 28 U.S.C. § 534, which granted the office of the Attorney General the ability to "acquire, collect, classify, and preserve identification, criminal identification, crime, and other records" with the ability to appoint officials to oversee this duty, including the subordinate members of the Bureau of Investigation . The Attorney General, in turn, designated the FBI to serve as the national clearinghouse for the data collected, and the FBI assumed responsibility for managing the UCR Program in September 1930 . The July 1930 issue of the IACP crime report announced the FBI's takeover of the program . While the IACP discontinued oversight of the program, they continued to advise the FBI to better the UCR . </P> <P> Since 1935, the FBI served as a data clearinghouse; organizing, collecting, and disseminating information voluntarily submitted by local, state, federal and tribal law enforcement agencies . The UCR remained the primary tool for collection and analysis of data for the next half century . Throughout the 1980s, a series of National UCR Conferences were with members from the IACP, Department of Justice, including the FBI, and newly formed Bureau of Justice Statistics (BJS). The purpose was to determine necessary system revisions and then implement them . The result of these conferences was the release of a Blueprint for the Future of the Uniform Crime Reporting Program release in May 1985, detailing the necessary revisions . The report proposed splitting reported data into two separate categories, the eight serious crimes (which later became known as "Part I index crimes") and 21 less commonly reported crimes (which later became known as "Part II index crimes"). </P> <P> In 2003, FBI UCR data were compiled from more than 16,000 agencies, representing 93 percent of the population in 46 states and the District of Columbia . While nationally reporting is not mandated, many states have instituted laws requiring law enforcement within those states to provide UCR data . </P>

The uniform crime reports give information on how many indexed crimes