Saddam was arrested at Karumathampatti, on the outskirts, they said.
Sasikumar, district spokesperson of the organisation, was returning home in Subramaniampalayam, in the outskirts, on a two-wheeler when the unidentified assailants chased him on motorcycles and attacked him with sickles on September 22 last year.
He succumbed to his injuries at a hospital later.
His funeral procession the next day triggered violent protests in Coimbatore.
Saddam will be produced before a judicial magistrate court here tomorrow and efforts are on to apprehend the other accused involved the case, they said.
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