Addressing the general body meeting of the Karnataka Pradesh Congress Committee here, the senior Congress leader claimed that BJP now feels that it cannot win the polls without communalising it.
"They (the BJP) would be instigating communal riots in Congress-ruled states," Singh, in-charge of Congress affairs in Karnataka, alleged.
He added that BJP would also "communalise" the "body politic" in states not governed by it.
"We have to be very, very careful and keep an eye on these people," he said.
Singh advised Chief Minister Siddaramaiah to keep Sangh pariwar outfits on a tight leash.
Claiming that the Sangh operates through more than 150 different organisations, he said they have to be kept under strict watch, adding that there should also be strict control over "communal elements so that they don't spread the ideology of communal violence and hatred.