"We will move court tomorrow," said Barrister S Pal, who is representing Tata Motors.
Asked which part of the Singur Land Rehabilitation and Development Bill, 2011, would they will be challenging, he said, "We are challenging the whole act".
The Bill was passed in the state Assembly on June 14, amid a walkout by the Opposition Left parties, by voice vote along with some amendments brought by the government.
It had also received Governor M K Narayanan's assent on Monday.
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