The document discusses Soviet control over Eastern Europe from 1948 to 1989. It provides background information on how countries like Hungary, Poland, Czechoslovakia lost democratic rights and freedoms after World War 2 and came under strict Soviet control. It then discusses some key events that challenged this control, like the Hungarian uprising in 1956 and Prague Spring reforms in Czechoslovakia in 1968. The Soviet Union used military force to assert its dominance each time. The rise of the Solidarity trade union movement in Poland in the 1980s further declined Soviet influence in the region.