You selected: Tuesday, December 25, 1956
The corresponding Jewish date is: Tevet 21, 5717*
From Wikipedia:
Victor Vancier (born December 25, 1956), commonly referred to by his Hebrew name, Chaim Ben Pesach (Hebrew: חיים בן פסח) is an American political activist and the founder and director[citation needed] of the United States-based Kahanist organization, Jewish Task Force (JTF)[citation needed] and the former National Chairman of the Jewish Defense League (JDL) in the United States.[1] In 1987, he was convicted on charges related to a series of bombings conducted during his time with the JDL to protest Soviet treatment of Jews.[1] He served over five years in federal prison for his involvement in 18 bombings in New York and Washington.[2]
Note: I removed where they called him a terrorist.