The verbatim record of the negotiations between the strikers' committee and the Polish government commission resulting in the agreement of August 31, 1980, is a precious historical source on a landmark event. In the 1980s, Solidarity was a broad anti-bureaucratic social movement, using the methods of civil resistance to advance the causes of workers' rights and social change. The government attempted to destroy the union by imposing martial law in Poland, which lasted from December 1981 to July 1983 and was followed by several years of political repression, but in the end it was forced to negotiate with Solidarity. In the union's clandestine years, the United States provided significant financial support, estimated to be as much as 50 million US dollars.