After a short time, we got to a series of cases where a prosecutor had empaneled a grand jury and gotten an indictment against some poor soul — almost always poverty-stricken and often black — who had either no evidence against him (and he was almost always male). That poor soul usually was convicted. He went to prison and that was that.
The evidence put before the grand jury — again — was almost always trivial or nil. The convict rarely was afforded an appeal and, even if he did appeal, he rarely got any relief. This was called prosecutorial discretion or misconduct.