On 4 June 1989 , the trade union Solidarity won an overwhelming victory in a partially free election Choosing in Poland , leading to the peaceful fall of Communism in that country in the summer of 1989 .

The Solidarity Day marches were a pair of large political rallies Social_event in support Supporting of organized Arranging labor Employment that took place Process_start in Washington , D.C. on September 19 , 1981 and August 31 , 1991 .