The case was registered yesterday, police said.
The four accused were identified as Prabhakar Raul (former Palghar district chief of Shiv Sena); Mukesh Patil (party's city unit chief), Neelam Sankhe (Shiv Sena's Boisar taluka chief) and Jagdish Dhodi (Shiv Sena's Boisar assembly constituency region head), they said.
According to police, the four persons stormed into his factory located in Boisar MIDC in the afternoon on May 16, threatened the security supervisor and demanded Rs 10 lakh.
They threatened that if they failed to get the money, they will see to it that the factory is shut down, the complaint says.
None of them have been arrested so far and further investigation is on, police said.
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