Jerzy Popiełuszko (Polish pronunciation: [ˈjɛʐɨ popʲɛˈwuʂkɔ]; 14 September 1947 – 19 October 1984) was a Polish Roman Catholic priest who became associated with the opposition Solidarity trade union in communist Poland. He was murdered in 1984 by three agents of Służba Bezpieczeństwa (Security Service of the Ministry of Internal Affairs), who were shortly thereafter tried and convicted of the murder.
He has been recognized as a martyr by the Roman Catholic Church, and was beatified on 6 June 2010 by Archbishop Angelo Amato on behalf of Pope Benedict XVI. A miracle attributed to his intercession and required for his canonization is now under investigation.
From Wikipedia https://en.wikipedia.org/wiki/Jerzy_Popie%C5%82uszko