The probe agency filed the charge sheet in a special CBI court in Thalassery under various sections of IPC, Unlawful Activities Prevention Act (UAPA) and Explosive Substances Act in the murder case of E Manoj, an office bearer of RSS, by CPI-M activists last year, a CBI spokesperson said here.
CBI had registered a case in November last on the state government's request after the incident took place in Thalassery in Kannur district on September 1, 2014.
Manoj was allegedly killed by hurling bombs and inflicting knife injuries, when he was travelling in a vehicle through Kathirur-Ukkas Motta road, by a group of workers of a political party (CPI-M) under the leadership of K T Vikraman and others, the CBI said.
The agency further added that the findings were based on the investigation and evidence collected by it during the probe.