The Anti-Defamation League (ADL), formerly known as the Anti-Defamation League of B'nai B'rith, is a New York–based international Jewish non-governmental organization and advocacy group. It was founded in late September 1913 by the Independent Order of B'nai B'rith, a Jewish service organization, in the wake of the contentious murder conviction of Leo Frank. ADL subsequently split from B'nai B'rit... Wikipedia