The protest was organized by leaders of India's ruling Congress party, the BBC reported.
Party head Sonia Gandhi, Prime Minister Manmohan Singh and prominent party member Rahul Gandhi gave speeches in defense of economic reforms, which include allowing the likes of Walmart and Tesco to enter the Indian market.
Singh said those opposing moves to open the retail sector to foreign firms were "misleading the people."
Gandhi delivered a speech addressing corruption allegations made against her party and its allies over the past two years.
"I admit, corruption is a cancer, it is a disease," Gandhi said. "We will continue to fight this disease. Those who dig a pit for others to fall should know that a well is waiting for them to fall into."