The parties questioned Government over timing of the reforms' announcement, made ahead of the Prime Minister's tour of UK, G-29 Summit in Turkey and visits to ASEAN countries, slamming Modi for taking the decision without seeking Cabinet's approval, which they said was "complete" travesty of system of Parliamentary democracy.
"This license to loot (for foreign investors) comes at a time when majority of Indian people continue to groan under newer economic burdens. Price rise of essential commodities continues unabated. Agrarian distress is deepening.
The Left party said both India's markets and resources are being opened up further for maximization of profits for foreign capital.
Earlier on Tuesday, when the reforms were declared, party general secretary Sitaram Yechury had accused Modi of helping foreign players gain greater access to Indian markets and command over the country's resources for profits.
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"With the global economic crisis, foreign players are looking for greater market access and command over Indian resources to maintain its profits. PM Modi is helping achieve that objective instead providing people relief from growing prices and agricultural distress," Yechury had charged.
"These policies will damage livelihood of our workers, increase unemployment, make the country more dependent on the West and hence, should be rolled back," it insisted.
Pushing ahead with major reforms, the government on Tuesday relaxed foreign investment rules in 15 sectors such as civil aviation, banking, defence, retail and news broadcasting and eased the process for approval of FDI.