Do not listen to this guy. This is such a dangerous, outdated and bad advice that will only scare your dog and worst will make him bite you. Get some real help with professionals in your area. Abused dogs are really hard to train so please stay away from advice from strangers on the internet.
Nazis are not only grumpy assholes, they literally want to kill entire groups of people just because of their skin colour or ethnicity. A democracy can‘t tolerate people like that because they themselves are anti-democratic.