From the article:
Forty years ago Tuesday, a van loaded with explosives rocked the University of Wisconsin-Madison campus, killing one person and wounding three others -- all part of a protest against the war in Vietnam. It was also the biggest domestic terrorism attack until the Oklahoma City bombing 25 years later.
Three of four of the anti-war culprits were captured and served time in prison. But 40 years later, the hunt for the fourth suspect -- Leo Burt, a student and aspiring journalist at the time -- continues.
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FBI Hunts for Wisconsin Campus Bomb Suspect Leo Burt 40 Years Later