There is literally nothing you can do. If he truly fears for his life, he needs to report to the captain or lieutenant and ask to be placed in protective custody (PC). This is not a great option, but it is better than being someplace where you fear for your life.
https://www.inmateaid.com/ask-the-inmate/my-son-was-just-transferr-d-to-south-central-correctional-facility-yesterday-he-called-me-today-an-wants-me-to-call-classification-center-in-wayne-co-and-have-him-moved-he-said-he-is-in-fear-o-his-life-how-do-i-do-this#answer
Accepted Answer Date Created: February 27,2019