I'm sure it won't be a problem for someone with the name "Poloniusz" to write a well written letter in Polish
Soviet interference and oppression in Poland continued but it didn't end in 1956.
Of course. The communist terror lasted although it wasn`t as intense as before 1956 and after that date it was mostly carried out by Polish communists and their Polish henchmen.
But don`t worry - that period is covered by other museums and exhibitions. E.g., the case of Stanisław Pyjas, murdered on the communist police`s instigation, will be presented in a new exhibition soon. There is a plaque to his memory, too.
The defence of the cross in Nowa Huta or street fights and killing of Bodgan Włosik after the declaration of martial law is covered by the Museum of Nowa Huta.