Irving David Rubin was a Canadian-born American political and religious activist who served as chairman of the Jewish Defense League (JDL) from 1985 to 2002. He committed suicide in jail when awaiting trial on charges of conspiracy to bomb private and government property.

The Jewish Defense League (JDL) is a far-right religious and political organization in the United States and Canada. Its stated goal is to "protect Jews from antisemitism by whatever means necessary"; it has been classified as "right-wing terrorist group" by the Federal Bureau of Investigation (FBI) since 2001, and is also designated as hate group by the Southern Poverty Law Center. According to the FBI, the JDL has been involved in plotting and executing acts of terrorism within the United States. Most terrorist watch groups classify the group as inactive as of 2015.