Description (slightly modified) is taken from the abstract to Oula Silvennoinen's PhD thesis *Salaiset aseveljet: Suomen ja Saksan turvallisuuspoliisiyhteistyö 1933-1944* [Secret brothers-in-arms: The cooperation of the Finnish and German security police 1933-1944] (PhD diss., Helsinki University, 2008), https://helda.helsinki.fi/handle/10138/19518.
In 1941, as Finland joined the German assault on the Soviet Union, together with the Finnish Security Police, the RSHA set up a previously unknown special unit, the Einsatzkommando Finnland, entrusted with the destruction of the perceived ideological and racial enemies on the northernmost part of the German Eastern Front. Joint actions in northern Finland led also members of the Finnish State Police to become participants in mass murders of Communists and Jews. Post-war criminal investigations into war crimes cases involving former security police personnel were invariably stymied because of the absence of usually both the suspects and the evidence.
Einsatzkommando der Sicherheitspolizei und des SD beim AOK Norwegen, Befehlsstelle Finnland