They are among nine MOVE members convicted of third-degree murder in the death of Officer James Ramp during an attempted eviction.
Seven years later, police bombed another MOVE house in West Philadelphia, starting a fire that killed 11 people and destroyed 61 homes.
State parole board spokesman Leo Dunn says William Phillips and Delbert Orr were denied parole Wednesday, following similar rulings for five others.
One member died in prison. The one remaining member, Charles Sims, goes before the board in November.
Prosecutors want each to serve the full 30- to 100-year sentence.