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This act authorized the federal government to build the first three federal penitentiaries, being: the USP Leavenworth, the USP Atlanta, and the USP McNeil Island, since then the amount has increased to 22 federal penitentiaries.
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The Bureau of Prisons was established in 1930, within the Department of Justice, the Bureau of Prisons started to manage all the Federal penal and correctional institutions.
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The 1980s was a period of increased in the number of Federal inmates due to the Federal law enforcement efforts and the new legislation, that brought much more criminals to penitentiaries.
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The Sentencing Reform Act of 1984 established determinate sentencing for inmates sentencing, abolished parole for some of the inmates, and reduced prison time for good behavior.
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Nowadays the inmate population has decreased to 158,324, which is a big difference from the inmate population of 2013 which was around 217,000 inmates.