The Helsinki Group, which was founded in Lithuania after the international conference in Helsinki (Finland), where the post-WWII borders were acknowledged, announced a declaration for Lithuania's independence on foreign radio station. The Helsinki Group informed the Western world about the situation in the Soviet Lithuania and violations of human rights. With the beginning of the increased openness and transparency in government institutions and activities ("glasnost") in the Soviet Union, on 3 June 1988, the Sąjūdis was established in Lithuania. Very soon it began to seek country's independence. Vytautas Landsbergis became movement's leader. The supporters of Sąjūdis joined movement's groups all over Lithuania. On 23 August 1988 a big rally took place at the Vingis Park in Vilnius. It was attended by approx. 250,000 people. A year later, on 23 August 1989 commemorating the 50th anniversary of the Molotov-Ribbentrop Pact and aiming to draw the attention of the whole world to the occupation of the Baltic states, a political demonstration, the Baltic Way, was organized. The event, led by Sąjūdis, was a human chain spanning across Vilnius, Riga and Tallinn, indicating the desire of the people of Lithuania, Latvia, and Estonia to break away from the Soviet Union.