Abakumov was executed for his crimes during the Stalin years. (BTW, Abakumov is not that uncommon of a surname)
The beef is Latvia, Estonia, and Lithuania allow these parades to happen, erect memorials to the SS guys, etc. There should be more countries in addition to Russia protesting this - ESPECIALLY in light of the FACT that they are members in NATO, an organization which was created to a.) counter the Soviet threat, and b.) keep an eye on Germany so that NAZIS could not rise again. Disgusting - I'm VERY disappointed in Latvia.....
Maybe Latvia needs a strong-arm dictator to prevent marches?
In view of Russia's behavior in Baltics in1940 - Russia does not have any moral standing even to fart on this subject, to speak nothing of protesting. Since it considers itself to be a successor state to the USSR - it succeeded to USSR reputation and the responsibility for its history as well. I do not know how to live down such a reputation, but several generations of blameless behavior seem to be a minimum. Germany's denazification efforts come to mind as a convenient example.