In 1920, the Solvay Process Company merged with four other chemical companies, forming Allied Chemical and Dye Corporation. In 1950 it began the production of chlorine by mercury cell in 1950. Mercury-contaminated waste was also dumped directly into Onondaga Lake. Allied Chemical and Dye Corporation became Allied Chemical Corporation in 1958. Its continued practice of allowing mercury into the lake led to the federal and state governments banning fishing in 1970, due to mercury contamination of the fish. The US Attorney General sued Allied Chemical to halt the dumping of mercury into the lake. It is estimated that Allied Chemical was dumping approximately 25 pounds of mercury into Onondaga Lake per day. In 1981 Allied Chemical Corporation become Allied Corporation; in 1985 it changed its name to Allied-Signal, Inc. when it merged with the Signal companies. The company announced that it would close its operations in Syracuse because of changes in environmental laws, and in 1986 began dismantling its facility.