The Dima Halem Daogah (Jewel faction) on Thursday challenged the ban imposed on it by the Centre in July saying it had joined the mainstream and has abjured violence.
The ban was challenged before an Unlawful Activities Prevention Tribunal headed by sitting judge of Delhi High Court Justice K Gambhir, which held its hearing in Shillong.
The outfit was banned in the backdrop of violence in Assam, particularly in the North Cachar Hills district, but its cadre have surrendered and are having peace parleys with the government, Advocate Bijon Mahajan, who represented the outfit, told PTI quoting their reply to a show-cause by the Tribunal as to why the group should not be banned.
He said the group had joined the mainstream on October 2. "Since then, they have adhered to the ground-rules and have been staying in designated camps."
The Tribunal had issued the show-cause to the group's chairman Jewel Garlosa in its first sitting on August 12.
The next sitting of the Tribunal will be held in Delhi in December.
Altogether 446 cadre of the group, also called Black Widow, laid down a huge cache of arms and ammunition on October two, in what was seen as the beginning of a peace process in the trouble-torn NC Hills district of Assam.