OUN’s response was an assassination campaign. In the early 1930s OUN killed dozens of Polish policemen and officials, as well as several prominent Ukrainian moderates. Its best-known victim was Bronislaw Pieracki, the interior minister responsible for the outrages in Galicia. Though OUN leaders were eventually rounded up and imprisoned, the organisation continued to expand right up to the Second World War, when it formed the basis of the Ukrainian partisan army.
