Adani group stocks faced heavy drubbing during the early trade on Thursday, with Adani Energy and Adani Enterprises tumbling 20 per cent, as billionaire Gautam Adani has been charged by US prosecutors over his role in an alleged years-long scheme to pay $250 million bribe to Indian officials in exchange for favourable terms for solar power contracts.The stock of the group's flagship firm Adani Enterprises plunged 20 per cent, Adani Energy Solutions tanked 20 per cent, Adani Green Energy plummeted 19.17 per cent, Adani Total Gas tumbled 18.14 per cent, Adani Power slumped 17.79 per cent, and Adani Ports dived 15 per cent on the BSE.