"Today, Dow Chemicals is trying to influence the highest offices in the country - bargaining for immunity in return for investments," D Raja said in the Zero Hour in the Rajya Sabha.

He said Prime Minister Manmohan Singh had assured the survivors of the December 1984 gas tragedy that he would do everything within law to hold Union Carbide and Dow Chemicals accountable.

"In these two years of unkept promises, more than 720 people have died because of gas related illnesses," he said, adding several children have been born with grotesque deformities.

Raja alleged that by "manipulating" officials in the Agriculture Ministry, Dow Chemicals has managed to get registered three pesticides in India, one of which is banned in the US.