According to police, O G Madanan and Kanikari Kuttan were arrested from Rajakkad by the police team probing the murder of INTUC activist Anjeri Baby in early 1980s.
Mani, a former CPI(M) district secretary, was arrested on November 21 after he declined to comply with the police's demand to turn up for a polygraph test.
While addressing a public meeting at Manakkad near Thodupuzha in the district a few months ago, Mani said his party had in the 1980s drawn up a list of political rivals to be eliminated and executed that, which sparked a raging controversy within and outside the state.
With Mani's speech causing deep embarrassment to even the central leadership of the CPI(M), he was removed as party Idukki district secretary and suspended from the state committee in July last.
