Video shows a man speeding after a group of young protesters in his SUV, then rushing them with blades strapped to his arm.
The ACLU said one-fifth of the inmate population at Elkton Federal Correctional Institution in Ohio is infected.
Black Lives Matter filed suit along with the American Civil Liberty Union against the administration for violating the protesters' civil rights.
"We made the decision to terminate Kimberly and Beck yesterday as soon as we learned of their comments," said Robert Morgan, an iHeartMedia regional president.
Drew Brees apologized, saying his words were insensitive and lacking awareness, after he criticized players who protest racial injustice by kneeling during the national anthem. His comments triggered backlash from teammates, Lebron James and others.