Former Liberian President Charles Taylor became the first head of state since World War II to be convicted by an international war crimes court, a historic verdict that sends a message that tyrants worldwide will be tracked down and brought to justice.

The warlord-turned-president was found guilty on Thursday of 11 counts of war crimes and crimes against humanity for arming Sierra Leone rebels in exchange for “blood diamonds” mined by slave laborers and smuggled across the border.