city and Ludwigsburg Palace in the ending moments of his state visit to Germany, and Queen Elizabeth II of the United Kingdom visited the city 24 May 1965. On 25 April 1952, the other two parts of the former German states of Baden and Württemberg, South Baden and Württemberg-Hohenzollern merged and formed the modern German state of Baden-Württemberg, with Stuttgart as its capital. Since the 1950s, Stuttgart has been the third largest city in southern Germany behind Frankfurt and Munich. The city's population, halved by the Second World War, began sudden growth with the mass influx of German refugees expelled from their homes and communities by the Soviets from the late 1940s until 1950 to the city. Economic migrants, called "Gastarbeiter," from Italy, and later Greece and Turkey but primarily from Yugoslavia, came flocking to Stuttgart because of the economic wonder called the "Wirtschaftswunder" unfolding in West Germany. These factors saw the city reach its (then) peak population of 640,000 in 1962. In May 1965 Queen Elizabeth II made a state visit to Stuttgart and nearby Marbach and Schwäbisch Hall. Her great-grandfather Duke Francis (1837-1900) had been a member of the Württemberg royal family. In the late 1970s, the municipal district of Stammheim was centre stage to one of the most controversial periods of German post-war history. Stammheim Prison, built from 1959 to 1963, came to be the place of incarceration for Ulrike Meinhof, Andreas Baader, Gudrun Ensslin, and Jan-Carl Raspe, members of a communist terrorist organization known as the Red Army Faction, during their trial at the Oberlandesgericht Stuttgart in 1975. Several attempts were made by the organization to free the terrorists during the "German Autumn" of 1977 that culminated in such events as the kidnap and murder of Hanns-Martin Schleyer and the hijacking of Lufthansa Flight 181. When it became clear, after many attempts to free the inmates including the smuggling of three weapons into the prison by their lawyer, that the terrorists could not escape and that they would receive Life sentencing, the terrorists killed themselves in April 1977 in an event remembered locally as the "Todesnacht von Stammheim," "Night of Death at Stammheim." The trauma of the early 1970s was quickly left behind, starting in 1974 with the 1974 FIFA World Cup and the opening of the Stuttgart S-Bahn on 1 October 1978 with a scheduled three routes. from 17 to 19 June 1983, ten European