general david barno, retired general, thank you. and scott smith, we thank you. >> thank you. >> thanks very much. >> woodruff: in the largest ever one-time release of federal prisoners, the justice department announced today a plan to set free some 6,000 inmates. jeffrey brown looks at that, part of our ongoing series, "broken justice," on efforts to address mass incarceration in the u.s. >> brown: the move is aimed at non-violent drug offenders, and it's part of a broader push on a number of fronts to provide relief to individuals hit with harsh sentences, and to reduce overcrowded prisons. the first group of inmates from around the nation will be released between october 30 and november 1. more will follow in the coming year. joining us now is maurice chammah of the marshall project, a non-profit news site focused on criminal justice issues. welcome to you. so first tell us a little bit about who these 6,000 prisoners are. why are they in particular being released? >> sure. so these are all, according to the department of justice