sentences:  Jiu Valley miners' strike of 1977
  
  The Jiu Valley miners' strike of 1977 was the largest protest movement against the Communist regime in Romania before its final days, ushering in a period of intermittent labour unrest that would last a dozen years, and the most important challenge posed by a group of workers to the regime since the protests triggered by the Hungarian Revolution of 1956.It took place 1–3 August 1977 and was centred in the mining town of Lupeni, in Transylvania's Jiu Valley.