Indian Secular Front (ISF) activists fought a pitched battle with the police at Esplanade area in central Kolkata on Saturday during a protest against alleged attacks on their workers by the ruling Trinamool Congress in South 24 Parganas district. The demonstration threw the traffic out of gear around the key Jawarharlal Nehru Road crossing. The sole ISF MLA Naushad Siddique, who was leading the protest, was detained, as a number of police personnel and agitators were injured.