Police have registered a case against six persons for allegedly beating up a social worker, who is also head of a cobblers` association, and trying to extort money from him in Maharashtra`s Thane city, an official told news agency PTI on Monday.

According to a complaint filed by Raju Chavan, president of the Maharashtra Rajya Gatai Charmakar Sanghatana, he was near the shoe stall of his brothers in Naupada area on Saturday night, the official from Naupada police station told PTI.