Those produced before the Kunnamangalam Judicial First Class Magistrate Court were Kunnamakkara CPI(M) local committee member K C Ramachandran, Dilshad, P K Mohammed Faizal and Saneesh.
While the court remanded Ramachandran to 14 days police custody, the other three were remanded to police custody for four days.
Meanwhile, the SIT today arrested CPI(M) Methale Kunnothuparambu Branch Secretary Manojan and one Shanoj from Thalassery in Kannur district in connection with the case.
With this, the SIT has so far arrested 11 persons in connection with the murder.
50-year-old Chandrasekharan was murdered on May 4 at Vallikkadu near Vatakara town in the district.
The assailants, who came by a car, attacked him while he was riding a motorcycle alone. Country-made bombs were hurled at him before he was hacked to death with sharp weapons.
A former CPI(M) leader in the party stronghold Onjiyam in Kozhikode district, Chandrasekharan was expelled a few years ago after falling out with the leadership. He later joined RMP floated by CPI(M) activists who either quit the party over ideological issues or expelled for anti-party activities.