Acting on a tip-off, police caught Anil Kharwal alias Anandji, who is the zonal commander of three districts of Jharkhand, along with his brother-in-law.
There were 18 cases registered against Kharwal who was suspected to have come to Assam to organise the banned outfit in rural areas of the state.
Police did not reveal his brother-in-law's name as his involvement with the outfit was yet to be ascertained.
