"We will stay put here for five hours," said city unit Congress president Narendra Ravat.
The complaint registered at Manjalpur police station yesterday alleged that the pamphlet was defamatory against Modi as it accuses him in the context of corruption and also refers to the snooping scandal involving a young woman architect.
Mistry rushed here from Delhi last night on learning of registration of the complaint. Denying that the pamphlet broke any law, Mistry had claimed that it was "vetted by the Election Commission fifteen days ago and does not mention Modi's name".
He has demanded transfer of the District Collector and the city Police Commissioner for their "partisan" attitude.
"Why the Chhota Udepur district administration did not take any action against Social Welfare Minister Ramanlal Vora for casting aspersions against Congress president Sonia Gandhi, vice-president Rahul Gandhi and other leaders in a rally by insinuating that they are inefficient," Mistry said last night.
He alleged that Chhota Udepur district returning officer and district superintendent of police did not register complaint against Vora since he is a minister in the Modi cabinet.
Besides Mistry, local leaders, including the Leader of Opposition of Congress in the city municipal corporation Chandrakant Srivstava, district unit Congress president Vinubhai Patel, are also participating in the sit-in agitation being held near the statue of Mahatma Gandhi under Raopura assembly constituency.