It has nothing to do with unions.
Many states don’t have unions. Decades of personal knowledge of this with Texas prisons is they are constantly running shifts without the required and legal number of guards per inmates. There’s no conspiracy. The plain simple fact is there’s a large turnover employee rate when you get feces and urine thrown at you and you’re always on your feet so you come home with joints hurting.
It does in New York, remember not too long ago another upstate NY prison break where the union guards exchanged sex for getting the prisoner out - they made movie out of it. These guards ain't too bright, they only need to know one thing, elect their union boss.
That is not the MCC - these are coveted jobs with big law enforcement benefits