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In page Kilvenmani massacre:

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The incident occurred when some poor labourers were influenced by the Communist Party of India (Marxist) to organise themselves into a campaign for higher wages following the increase in agricultural production as the result of the Green Revolution in India.[1][2] The lands were controlled by powerful families, while the labourers were from a marginalized community. In 1968, the agricultural labourers of unified Tanjore district formed a union seeking better working conditions and higher wages.[3] To mark their union the workers hoisted red flags in their villages, irking their landlords. The landlords formed a separate union with yellow flags and started laying off workers belonging to the Communist unions.[citation needed]