Unfortunately I don’t have a source for ‘SS officer attachés […] were so disgusted with the actions of Baltic Nazi Partisans that many decided to volunteer in assisting Red Army forces in capturing and stopping the partisans after the war’, but for now, I can tell you this:
According to Mindaugas Pocius, a Lithuanian historian and author of “The Far Side of the Moon” (Kita mėnulio pusė), an extensive study on the reprisals, over 9,000 civilians — including no fewer than 300 children — were designated as collaborators, court‐martialled and executed by the Forest Brothers.
Unfortunately I don’t have a source for ‘SS officer attachés […] were so disgusted with the actions of Baltic Nazi Partisans that many decided to volunteer in assisting Red Army forces in capturing and stopping the partisans after the war’, but for now, I can tell you this:
(Source.)