Minamata disease is a neurological syndrome caused by severe mercury poisoning. The name corresponds to the name of the Minamata Bay in Kumamoto prefecture where the disease was first identified. During 1932-1968 local residents, especially fisher families have been suffering from a variety of symptoms. The cause (recognized in 1958) was the release of methylmercury in the industrial waste by Chisso Corporation Factory over a period of 36 years. In this sense, the disease was caused by the consumption of heavy metals which the victims ingested through contaminated fish. Fishermen demanded compensation for fishing families to damage to fishing grounds . Fishermen demanded 100.000.000 Y but they only receive 35.000.000 Y (less than 100.000 $). On 2 November 1959 the fishermen stormed the Chisso factory, destroying machinery. The riot police arrested them. The regional labour union and the citizens of Minamat sided with the Chisso company, at this point. Chisso was ready to pay some compensations but refused legal liability, until a court case was started years later.