New Delhi, May 01 (ANI): Congress party workers staged protest in front of BJP headquarters in New Delhi on Thursday demanding response to 50 corruption cases in which BJP is allegedly involved. Seemingly irked at the scam allegations Congress President Sonia Gandhi's son-in-law Robert Vadra, Congress Party workers who staged protest, raked up allegations against son-in-law of Atal Bihari Vajpayee, Ranjan Bharttacharya. Earlier, BJP leadership released a video and a booklet as the party's sharpest attack on Vadra and the Congress party. Flamboyant businessman Vadra has denied the accusations levelled by anti-corruption activists, of improper dealings with DLF.