This was the second longest human chain ever formed in the state. Over 30 lakh Communist Party of India-Marxist (CPI-M) activists Oct 2, 2009, formed a 500-km human chain to protest a free trade agreement signed between New Delhi and the Association of South East Asian Nations.
http://ummid.com/news/2011/December/08.12.2011/human_chain_for_dam.htm
http://ummid.com/news/2011/December/08.12.2011/human_chain_for_dam.htm