What does enemy concerns mean?

I’ve been with my husband over a decade and never came across this.

I haven’t heard from my husband but wasn’t concerned because it’s a statewide lockdown for level 4s. Some random incarcerated man just called me and said he was passing a message to me from my husband and that my husband said he’s in the hole for “enemy concerns”.

What does this mean and what will happen? Do they transfer him somewhere else or what?

My husband already went pc from mainline a couple years ago so idk what this could mean? He’s not in a dropout gang.