According to a police complaint, the accused used to allegedly make extortion calls to former Gurgaon District (Urban) Congress Committee President Madan Lal Grover demanding Rs 10 crore from him.
The four accused have been identified as - Harish Addlakha from Gurgaon, Lalit from Darbhanga (Bihar), Aman from Kangra (Himachal Pradesh) and Harish from Almora (Uttarakand).
Addlakha, who is said to be the gang's mastermind, had allegedly called Grover on August 21 and threatened to eliminate him and his family members if he failed to pay them the extortion money, he said.
One Swift Dzire car, two motorcyles, eleven mobile phones and 14 SIM cards have been seized from their possession, he added.