Jagtar Singh Hawara – Jagtar Singh Hawara, who is considered the most-trained member of the Babbar Khalsa International terrorist group, headed by Wadhawa Singh, masterminded Beant Singh’s assassination. Hawara arranged the explosives and finances to purchase the Ambassador car from Delhi, which was used in assassination.

Lakhwinder Singh alias Lakha – A Punjab police constable, who was posted at the MT Section of Punjab Civil Secretariat. MT Section deals with the repair, fuelling and maintenance of official vehicles. Merely a few days before Beant Singh's assassination, he was put on duty with a former Member of Parliament as his driver. The day assassination took place, Lakhwinder had requested one of his colleagues to do his duty and he had reached Punjab Civil Secretariat, according to the assassination plan.

Shamsher Singh – A veteran of BKI, Shamsher’s house was a reliable explosives and terrorist hideout for the group. Hawara and others used to take shelter at Shamsher Singh's house and hide their explosives.