Just seeing this.  
https://thesocietypages.org/socimages/2015/04/03/race-criminal-background-and-employment/
I've read about this a few times. There are other studies.  Try googling 'whites criminal background vs blacks in employment'.  There are experiments designed to study this as well as a wealth of statistical data about the subject.   By the way blacks are biased against blacks, but not as biased as whites are.  To say something doesn't exist when there is overwhelming evidence that it does is not helpful.