set in train a series of events that led to the establishment of the Solidarity trade union, which was a key movement in the fall of Communism in eastern Europe. During his visit to Poland, John Paul visited Warsaw, Gniezno, Kraków, Nowy Targ, Auschwitz and Jasna Gora. The nine-day tour attracted millions of faithful. The Pope's visit to Ireland on 29 September drew immense crowds. 1,250,000 people, one quarter of the population of the island of Ireland, one third of the population of the Republic of Ireland, attended the opening Mass of the visit in Dublin's Phoenix Park. Over 250,000 attended a Liturgy of the Word in Drogheda later that evening. Hundreds of thousands lined the streets of Dublin that night for a motorcade from Dublin Airport to the Presidential Residence in the Phoenix Park. The following day, Sunday 30 September, included Masses in Galway (300,000), Knock (450,000) and a stop over at the monastic ruins of Clonmacnois (20,000). The final day of the visit began with a visit to the National Seminary in Maynooth (attended by 80,000). The final Mass of the visit was at Greenpark Racecourse in Limerick in the south of the country before 400,000 people which was more than had been expected. John Paul II made his first visit to the United States in October 1979. He arrived in Boston on 1 October. The next two days were spent in New York City, where he addressed the United Nations General Assembly. There he condemned all uses of concentration camps and torture on the 40th anniversary year of World War II's start in 1939 and subsequent establishment of such camps by both the invading German Nazis and Soviet Communists, with Communism's camps and tortures continuing after the war's end in 1945. The pope later spoke to students gathered at Madison Square Garden, and conducted Mass at the original Yankee Stadium for 75,000 people as well as at Shea Stadium to an audience of over 52,000. He arrived in Philadelphia on 3 October and Des Moines, Iowa on the next day before arriving in Chicago. There he celebrated Mass in Grant Park, met with civic leaders and Chicago's Polish community. Chicago was the largest Catholic archdiocese in the United States at the time and the home of the largest Polish community outside of Poland. He concluded his pilgrimage to the U.S. in Washington, D.C. where he became the