Black flags shown at V K Singh in Kolkata
Singh, who is in the city for the release of the Hindi version of his autobiography, encountered the protest at the airport.
The Communist Party of India-Marxist has asked Prime Minister Narendra Modi to sack Singh from the government.
Singh triggered a huge row when he used an analogy of stoning a dog while commenting on the burning of two Dalit children in a Haryana village by upper castes.
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