Crimes Committed by Ukrainian Nationalists, written with the aid of researcher, lawyer, and former Home Army soldier Władysław Siemaszko, recounts the 1942–45 massacres of Poles in Poland's prewar Wołyń Province.

It produced an avalanche of responses from massacre survivors and witnesses, providing additional facts about events and localities that had not been included in the original edition.

[1] The book features the first chronological register of Ukrainian OUN and UPA attacks on the Polish population, giving dates, places, short descriptions of crimes committed, estimated numbers of victims and, where possible, their names.

Most of the accounts are based on material gathered by Turowski for a memoir project begun in 1985 by Polish veterans of the Home Army's 27th Wołyń Division.

The authors identified by name almost 20,000 victims of Ukrainian ethnic cleansing in only half of Wołyń's administrative units; the true losses of Polish civilians—men, women and children—were in excess of 60,000.