Does Bengal poll violence trace back to Left movement in 1960s?

West Bengal continued to witness poll violence in the seventh and final phase of Lok Sabha elections with the BJP accusing the TMC workers of attacking its polling agents and stopping people from casting their votes. Speaking about the Bengal system, senior journalist Manoj Gairola said, "In the 1960s, the conditions of industries had started deteriorating in Bengal and the capital flow took place from Bengal to West India. No new industries were set up and labour unions became very strong. Left gained ground in Bengal and consolidated its position."