Clinton supported the wrong side in the Bosnian and Kosovan conflicts. He violated our national security interests in doing so. And he committed war crimes by deliberately bombing civilian targets, most notoriously the TV station in Belgrade that was asking too many embarrassing questions about his policies.
Most liberals loved it, and even today most Republicans seem confused about it. Yes, clinton was a war criminal. Those were the days when you could happily agree with Justin Raimondo.