A lawyer, Victor Smal, says that he was beaten when he objected to the T-shirts.
This video, however, seems to show that some people at the rally reacted strongly at the appearance of the anti-semites, ripping off their shirts, spraying them with a liquid and even beating one of them up.
Some are saying that this was a "false flag" operation to make a political party look bad.
Police questioned 36 people suspected of inciting ethnic hatred.
(h/t Vandoren)