Pacification of Ukrainians in Eastern Galicia
The Pacification of Ukrainians in Eastern Galicia was a punitive action against Ukrainians in Galicia, carried out by police and military of the Second Polish Republic from September until November 1930 in reaction to a wave of sabotage and acts of terror perpetrated by Ukrainian nationalists. It took place in 16 Polish counties of three southeastern voivodeships.
Source: Wikipedia — Pacification of Ukrainians in Eastern Galicia (CC BY-SA 4.0)