34-year-old Anandji, who is the zonal commander of Latehar, Garwah and Palamau districts of Jharkhand, was arrested from a hotel--Jironi Lodge--in Tezpur town, Sonitpur Additional Superintendent of Police P K Nath said.
His 24-year old brother-in-law, Anil Singh, a former employee of Power Grid Corporation of India Limited, was also taken into custody though his involvement with the outfit was yet to be ascertained, Nath said.
The duo had checked into the lodge last night and was arrested following specific information received by the police.
Anandji hailed from Dewar village in Latehar district and had joined the outfit in 2002.
There are 18 cases registered against him in Jharkhand and he carried a reward of Rs five lakh on his head.
He was also jailed for eleven months in 2007.
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Police suspected that he had come here to organise the outfit in the remote areas of the district.
Latehar police in Jharkhand was contacted in this connection and a team was expected to come here soon.