Germany has launched a poster campaign - 'Operation Last Chance II' - this week to find any remaining Nazis and bring them to justice.
The poster which depicts the entrance to the Nazi concentration camp, Auschwitz, says:
"Late, but not too late. Millions of innocents were murdered by Nazi war criminals. Some of the perpetrators are free and alive. Help us take them to court."
Over 2000 posters will go up in Berlin, Hamburg and Cologne, asking people to come forward, and offering rewards of up to 25,000 euros for any information that aids prosecution.
See here, and here, and here for more on the Demjanjuk conviction two years ago in Munich that inspired the campaign and saw a change in the approach of German courts to Nazi convictions.