Bill Ayers denies that he was a terrorist. But he clearly fits the definition below:
merriam-webster.com/dictionary/terrorism
merriam-webster.com/dictionary/terrorism
ter·ror·ism
noun \ˈter-ər-ˌi-zəm\
: the use of violent acts to frighten the people in an area as a way of trying to achieve a political goal
Sounds like a duck, quacks like a duck, it probably is a duck.