Party: http://en.wikipedia.org/wiki/Law_and_Justice

Leader: http://en.wikipedia.org/wiki/Jaros%C5%82aw_Kaczy%C5%84ski

Cases mentioned:

1. Doctor: http://pl.wikipedia.org/wiki/Sprawa_Miros%C5%82awa_G%2E . Police action cryptonim was "Mengele".

2. Politician suicide: http://en.wikipedia.org/wiki/Barbara_Blida

There were many more such cases. Recently other parties want Kaczyński to be brought before State Tribunal.