"The arrest of Dayamani Barla, who has been supporting the villagers of Nagri against acquisition of land, on the ground of violating law is improper," Brinda said, addressing a rally organised by the Adivasi Adhikar Rastriya Manch here.
Karat lauded Barla for backing the villagers of Nagri in their protest against land acquisition for setting up educational hub there.
Barla had on October 16 surrendered before a Ranchi court and was sent to judicial custody in connection with an agitation she had led in 2006.
Two days later, she obtained bail from the court, but was re-arrested on a second warrant in connection with "obstructing government work".