Jay-Z, Meek Mill, and sport and business leaders have pledged $50 million (£38 million) to reform the US criminal justice system.
The Reform Alliance, which was inspired by Meek Mill's recent stint in prison for a minor probation violation, hopes to free one million prisoners in five years, according to the BBC.
The owners of the New England Patriots and Philadelphia 76ers, Robert Kraft and Michael Rubin, are co-founders.
Reform Alliance says it wants to help people who are "trapped in the system."
The group's "mission" is to "dramatically reduce the number of people who are unjustly under the control of the criminal justice system, starting with probation and parole."
"To win, we will leverage our considerable resources to change laws, policies, hearts and minds," it says.
More than six million people can currently count themselves as part of the "correctional population" of the USA. It includes people in prisons and local jails, but is mostly made up of the more than four million people on probation or parole, according to Bureau of Justice statistics.
Probation is often given as a sentence instead of time in prison and can include conditions like being on a curfew or going to rehab.
Parole is when an inmate is released early from prison with similar conditions to probation.
Meek Mill has experienced all three: probation, parole, and jail.
The Reform Alliance says his case is an example of the "devastating and long-lasting effects" that can occur after one interaction with the criminal justice system.
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