Plenty of historical and literary evidence to support it - from public torture and executions of the enemies of the ruling class - which always attracted masses - to pogroms of unpopular minorities "indicted" by the ruling classes.
A good literary example comes from the film "Das Experiment" http://www.german-cinema.de/archive/film_view.php?film_id=543 based on the Stanford Prison Study (http://www.prisonexp.org/) which shows howe ordinary people are transformed, literally overnight, into fascist monsters when the "ruling class" (scientists conducting the experiment) give them the authority to control people identified as "inferior."
Wojtek