Selichos for the 20th of Sivan, in memory of those murdered during the Holocaust. Printed by the Central Bureau for the Religious Communities in Hungary. With an important introduction on the laws of Yahrtzeit, particularly for those who lost relatives during the Holocaust and did not know the precise dates. The twentieth of Sivan has been a traditional fast days for European Jewry from the time of the Crusades. It was first established as a public fast day by Rabbenu Tam and the Ba'alei Tosafot to commemorate the massacres of French Jewry by the crusaders. A factor in its selection was that the twentieth of Sivan can never occur on a Shabbat. It was chosen after the Chmielnicki massacres of 1648-49 (tach ve-tat תח-תט) by the Vaad Arba’ah Arazot as a public fast day to commemorate the murdered martyrs, since the slaughter had begun on that day in Nemirow. Another reason for its selection was that it was a remembrance by Polish Jewry of previous massacres. The Magen Avraham on Shulhan Arukh, O. H. 580, includes this day among the fast days that should be observed.