Overcrowdedness and overly harsh sentences have long plagued US prisons.
And so the U.S. Department of Justice has decided to take action.
It will release around 6,000 prisoners between October 30 and November 2.
The move comes after the U.S. Sentencing Commission reduced its sentencing guidelines for drug possession.
U.S. media described the upcoming release as one of its biggest ever.
The United States now has 2.2 million people behind bars.
That’s roughly a quarter of the world’s jailed population.
Some Americans worry, however, the mass release might trigger a rise in crime .
According to a 2014 report from the U.S. Bureau of Justice Statistics, more than 56 percent of the ex-convicts released between 2005 to 2010 were back in jail within 12 months.