On 1 May 1925, with Benito Mussolini already in power, a group of Italian intellectuals publicly denounced his fascist regime in an open letter. The signatories – scientists, philosophers, writers and artists – took a stand in support of the essential tenets of a free society: the rule of law, personal liberty and independent thinking, culture, art and science. Their open defiance against the brutal imposition of the fascist ideology – at great personal risk – proved that opposition was not only possible, but necessary. Today, 100 years later, the threat of fascism is back – and so we must...