The activist, Siva, was arrested last week, based on a complaint by the woman that he had cheated her after promising to get her land and had taken Rs 5,000.
However, the demonstrators alleged that the woman was used as a tool by the Isha Foundation at Vellingiri here to settle scores with Siva, who had accused the spiritual organisation of encroaching land belonging to government and tribals, police said.
Since there was no permission for the demonstration, the activists, including 38 women, were arrested, police said.
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