The Allies put them on trial after WWII.
The Israelis did it in the 1960s to one of the architects of the Holocaust, Eichman, after kidnapping him and shipping him to Jerusalem.
The people and jurists of Argentina did it in the 1980s to leaders of the regime that disappeared thousands of political opponents and hundreds of children (then Menem issued pardons and they had to do it all again twenty years later).
But in the past ten years, things have picked up a bit. There has been a steady trickle of cases against political and military leaders which attempt to hold them accountable for alleged crimes.
In 1998, a Spanish judge tried to do it to Chile’s former dictator, Augusto Pinochet.
In June 2001, the Serbia authorities delivered former President Slobodan Milosovic to face trial at the ICTY in The Hague.
In May 2006, former Liberian President Charles Taylor was delivered to the Special Court for Sierra Leone to face charges of war crimes and crimes against humanity. His trial continues in The Hague.
In July 2008, the ICC’s prosecutor decided to charge Sudan’s President Omar Hassan al-Bashir with genocide, crimes against humanity.
In November 2010, the ICC began hearing evidence in the trial of former DRC Vice President and elected Senator Jean-Pierre Bemba for crimes against humanity and war crimes.
And there have been a range of other cases in domestic jurisdictions.
LoR is slowly building an analysis of these cases. Any help is greatly appreciated (no point reinventing the digital wheel).