Additional District and Sessions Judge Pradeep Kumar also slapped on Mishri Lal Mandal, Sukhdev Sah, Vasudev Prasad and Ramdev Mandal a fine of Rs 10,000 each after finding them guilty in the murder of Anant Jha.
According to the prosecution, Jha, a native of Nepal, was murdered in Mehsi village in the Lokhi police station area on September 25, 1976, due to enmity between them.
The convicts have been sent to jail.
The court acquitted four other accused persons for want of evidence against them, while six others have died during trial of the case.