A woman was tied up, dragged on the road and locked inside a house by alleged Trinamool Congress (TMC) supporters who wanted to "forcibly" acquire her land for a village road in West Bengal's South Dinajpur district.
The incident has kicked up a storm, with opposition parties accusing the TMC of "letting loose goondaraj" in the state.
The TMC leadership dubbed the allegations as "baseless" and said they would look into it.
The woman identified as high school teacher and BJP supporter Smritikana Das, her mother and other family members were also assaulted by the group, led by panchayat members, at Nandanpur in Gangarampur block, the police said.
So far nobody has been arrested in connection with the incident that took place on Friday.
A video grab of the purported attack showed Nandanpur panchayat 'upa-pradhan' (deputy chief) Amal Sarkar and some others involved in the act, the police said.
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The TMC district leadership on Sunday expelled Sarkar for his alleged involvement in the incident, party sources said.
The video showed that the teacher fell down on the road when the attackers tied her hands and legs, and dragged her for nearly 30ft while raining blows on her.
The attackers then locked her up inside a house, belonging to a TMC block level worker.
Her sister, Soma, was also beaten up by the attackers when she went to Smritikana's rescue.
The teacher, who was discharged from a local hospital after preliminary treatment, lodged a complaint against Sarkar and four TMC supporters at Gangarampur police station, a police officer said.
"We are probing the incident and also talking to eye-witnesses," he said.
According to locals, the panchayat had recently taken up a project to build a road that would pass by the woman's land.
BJP state general secretary Sayantan Basu said, "These incidents are just a reflection of the goondaraj that has been going on in the state. The TMC has institutionalized hooliganism in the state. Just because the person was a lady teacher, such kind of torture was meted out to her."