My son is in the hole. He said he was scared for his life that a gang wanted to hurt him i am so scared that he is going to get hurt what can i do

If he is in the hole, he is safe. The hole is used for disciplinary reasons but also for protective measures, too. If he told the staff that he was scared for his life, he basically asked for help, to be "checked in to pc", or protective custody. He is likely to remain in the hole for the entire sentence unless they transfer him.