The leaders also vowed to work to ensure the victory of the saffron party in the ensuing polls.

"We have been betrayed by the Congress for over half a century. We have joined BJP with a hope for better future. We all will work towards victory of the party in the Lok Sabha polls," Raja Matin Nuri, leading the group, told reporters here in Singh's presence.

Addressing the gathering, Singh promised to work towards creating a "just society" with opportunity and progress for all if the party is voted to power in the leadership of L K Advani.

"Sachar committee has revealed the double standards adopted by Congress in its five decades of rule. The six year NDA rule is there for everyone to see. NDA in power under Advani would work for a society with justice for all," Singh said.