President Akhil Bharatiya Hindu Surakhsha Samiti Punjab Deepak Bhardwaj had lodged a complaint that an unknown caller was threatening him on phone, police said.
After tracing the call details, police identified the caller as Amarinder Singh Khalsa, resident of Susa village in Hoshiarpur district, they said.
A case under section 66-B of the Information and Technology Act was registered against him, police said.
He would be arrested soon, they added.