Brother got fired from job, that employer put a “strike” on his background check preventing him from getting other jobs

This “strike” shows up that his previous employer let him go due to “employee misconduct.” I’ve tried googling this but I can’t find anything relevant. What in the world is this and how can this be removed? Other prospective jobs can see this and keep turning him down. Is this the Equifax work number that new employers are looking at causing his issue? His previous employer used Equifax to do some if not all of his background check.