Sadly the locals were more than happy to take part in it.
True. Some of it no doubt at all was antisemitism. Remember the time though. The Soviets had annexed the Baltic Countries a year or so earlier and Stalin murdered and deported a bunch of people from all 3. Since so many prominent Commies were Jews, many associated the Jews with the Commies. Therefore when the Nazis rolled into the Baltic Countries, many of the locals were absolutely furious with the Commies and took out their anger on anybody they thought was sympathetic to the Commies. One slaughter brought about a counter slaughter. The same thing happened in Ukraine.