You're not serious. What a despicable claim.
Also, there is no statute of limitations on murder, much less war crimes.
https://en.wikipedia.org/wiki/Flight_and_expulsion_of_German...
Between 500.000 -2.000.000 German civilians, from the eastern part of Germany parish in the period 1945-1950.
https://en.wikipedia.org/wiki/Flight_and_expulsion_of_German...
Previous Polish governments have triad to take actions against some of the perpetrators:
http://www.telegraph.co.uk/news/worldnews/europe/poland/1376...
While I personally is against dragging old people in front of courts 70 years after the alleged crimes (polish or German), at list the Polish do not discriminate.