Conversation so far:
What was Elrich Mielke's role in the Bülowplatz trial?
Mielke and Erich Ziemer opened fire at point blank range at the Babylon Cinema, on Captain Anlauf, Sergeant Willig, and Captain Franz Lenck.
How many persons were murdered in the Bülowplatz murders?
Berlin Police Captains Paul Anlauf and Franz Lenck were murdered in the Bülowplatz murders.
Was anyone else besides Erich Mielke found guity for those Bülowplatz murders?
15 conspirators were convicted of the first degree murders of Berlin Police Captains Paul Anlauf and Franz Lenck.
Was Elrich Mielke imprisoned for the Bülowplatz murders?
Erich Mielke was convicted on two counts of murder.

Question: Why was he given such a short imprisonment for murder charges?
Self-contained rewrite: Why was Erich Mielke given such a short imprisonment for murder charges?