According to the university, Cramer was asked to resign the post after he sent an inappropriate e-mail.
It all started when someone warned Cramer that fliers, with his home address, were circulating.
Cramer responded with an e-mail that read in part "thanks for your concern. I have a Colt .45 and I know how to use it."
Chancellor Thorp issued a statement after the incident.
"Professor Emeritus Elliot Cramer has been retired from the University for 15 years. When the Youth for Western Civilization, a campus student group, needed an adviser, he agreed to serve. Today, he sent an e-mail that was highly inappropriate and not consistent with the civil discourse we are trying to achieve. I asked him to step down from his role as adviser, and he will do so."
The group Cramer was advising states it challenges left-wing education leaders.
Lately, it's stirred up debate on immigration issues.