During the Spanish civil war the single greatest atrocity perpetrated by the Republicans was known as ‘Paracuellos’. This was the village where an estimated 2,500 prisoners loyal to Franco were executed by leftish militiamen between November and December 1936.

Even though the facts of this massacre are now widely known, one question still remains: who ordered the killings? In his latest book The Last Stalinist,Paul Preston claims that it was Santiago Carrillo who played a crucial role in signing the death warrants.