The High Court, however, set free third convict Ranjan Dwivedi, a lawyer, of the charge of conspiring with convicts Santosh Anand and Sudevanand to bomb the car of the then CJI on the evening of March 20, 1975.
The appeals against the trial court's judgement were filed in the High Court in 1976 and the hearing commenced in 2006, after the lapse of three decades.
The convicts, who remained in jail for eleven years from 1975 to 1986 when they got bail, have been awarded ten years rigorous jail term under section 307 (attempt to murder) of the IPC.
In a separate offence of conspiracy under section 120B of the IPC, the court reduced the seven years jail term, earlier awarded by the trial court, to four years.
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"Considering the gravity of the offence whereby sinister attempt was made on the life of the then Chief Justice of India in a well planned conspiracy with the use of highly sophisticated explosives (hand grenades), the convicts A-1 (Santosh Anand) and A-3 (Sudevanand) deserve no leniency", it said.
The court said that a "befitting" punishment would serve the ends of justice.
"Despite claiming to be followers of the 'Organisation' (Anand Margi) which did not preach violence, the convicts indulged in the most foul and senseless murderous attack/ assault on the Chief Justice of India," it said.