At a rally Thursday outside City Hall, Pam Africa, chair of the International Concerned Family and Friends for Mumia Abu-Jamal, called the decision a victory.
"A partial victory," she said, "for the entire movement."
Africa said Abu-Jamal supporters are reinvigorated after Krasner dropped his appeal of a decision by Judge Leon Tucker to allow the convicted cop killer to reargue his appeal.
She claims evidence of judicial and police misconduct are plentiful, and they plan to up the pressure on Krasner for more.
"No less than Mumia be freed, released from prison now," she spoke at the rally.
Lawyers argue that former Chief Justice Ron Castile should have recused himself from ruling on Abu-Jamal's appeal since he was the district attorney during his original murder trial.
The Fraternal Order of Police, as well as Faulker's widow, Maureen Faulkner, both issued statements saying they are disappointed by Krasner's decision not to appeal the latest ruling.