The museum states that this is a copy of a Stasi note that planned to kill Lutz Eigendorf (1956-1983) who was an East German international football player who defected to West Germany. This defection was awkward as he played for BFC Dynamo, which was the plaything of Erich Mielke who also happened to be the head of the Stasi. I think it’s fair to say that he was displeased. The East Germans wanted to show off their sporting prowess and that’s made more difficult when the players run away.
Eigendorf was killed in 1983 in a car accident which was never fully explained. It’s clear what the museum thinks happened, although there’s no evidence that Mielke was personally involved with the decision to assassinate him, although he probably was. Mielke was one of the most evil men in East Germany, he was corrupt and he ended up in prison after communism came to an end. There have been investigations relatively recently, but there’s not sufficient evidence to prove he was murdered and the case has now been closed by the German authorities. Eigendorf was very brave to do what he did, not just the defection, but also the criticisms he made of East Germany whilst in the West. He never saw his wife or daughter again, but the communists didn’t dare let him be free.