sentences:  After hearing Colin Jordan, the leader of the National Socialist Movement, addressing a rally in Trafalgar Square in 1962, Greenman determined to tell his story to anyone who would listen.Late into his life, he would visit schools to bear witness to the Holocaust, showing them his tattoo and telling them his story.He donated photographs and mementos to the Jewish Museum in Finchley, which opened a permanent gallery showing his collection in 1995.