Some definitions of political terrorism expand the term to embrace almost any perpetrators of political violence. Some have argued that vigilante organizations such as the Ku Klux Klan should be deemed terrorists. Others would include all killers or violent criminals who have a remotely political purpose, such as Theodore Kaczynski. Others would include governments that commit random or horrific acts of violence against their own people, such as Nazi Germany, Stalin's Soviet Union, or Saddam Hussein's Iraq. Still other violent deeds—for example, the 1968 murder of Robert F. Kennedy by Sirhan Sirhan, who claimed he was acting on behalf of Palestinian nationalism but belonged to no organized group—are hard to rule in or rule out, suggesting that no definition is complete. Still, if we want terrorism to be a useful and distinct term in understanding today's violence, we shouldn't really describe these crimes as terrorist. Needless to say, such a judgment does nothing to diminish the evil of these deeds.