The cadres were nabbed by a team of local police from the forests of Burji village under Gangalur police station limits last evening, a senior police official said.
On sensing the security personnel near them, the duo made an attempt to escape but they were chased and nabbed, he said.
During investigation, they admitted to being involved in the movement, he said.
The two ultras were identified as Kadti Sannu (24) and Hemla Somlu (30), he said.
They were involved in several incidents of crime, including loot, arson and murder, the official said.