The Judge of Khulna divisional Speedy Trial Tribunal MA Rob Howlader handed down the verdict in presence of all convicts.
The convicted criminals are ex-UP chairman of Bhadravila union under Narail Sadar upazila M Sahedur Rahman Mina alias Shaheed, 52, his brother and son Md Ilias Mina, 56, and Ashikur Mina alias Ashik, 22, Md Russel Mina, 30, Bashar Molla, 30, Robiul Molla, 25, Enayet Molla, 53, Yasin Molla, 24, and Mamun Mina, 28.
According to prosecution, the criminals hacked Provash Roy, executive member of Narail Sadar upazila unit AL, while he was having tea with Khairuzzaman Fakir, general secretary of Vadrabila union unit AL at Mirapara bazaar area of Sadar upazila on February 1, 2017.
He was succumbed to his injuries at night on the way to Narail Medical College Hospital.
Public Prosecutor (PP) Enamul Haque said Provash went to visit Swaroswati Puja at the upazila headquarter on the day and the incident took place while he was returning home.
His wife Tutul Rani Roy filed a case with Narail Sadar police station accusing nine named and others seven unnamed people.
Quoting FIR, the PP said, Provash Roy supported and worked in favour of AL backed boat symbol getting candidate during UP election.
Meanwhile, independent candidate Sahedur Rahman Mina elected as UP chairman. The convict Sahedur and his supporters vandalized and looted at the residence of Provash after the election.
Provash filed a case with Narail Sadar Police Station following the incident, the PP added.
The criminals hacked to death Pravash for taking revenge, said Bhobotosh Roy, sub inspector of Narail Police Station. Bhabotosh, also the investigation officer of the murder case, pressed charge sheet to the Narail Magistrate court against nine people on February 22, 2017.