Bill de Blasio toured parts of the communist Soviet Union as the Cold War raged, The Post has learned. The Democratic mayoral candidate — who is enjoying a huge lead over Republican Joe Lhota coming into Tuesday’s election — was “back in the USSR” in 1983 while a student at NYU. It was the same year that President Ronald Reagan referred to the country’s regime as “The Evil Empire.” De Blasio’s trip also occurred five years before he went to Nicaragua in support of the Marxist Sandinista regime there to distribute food and medicine during its civil war. At the...