Grabbing farmers’ land triggered the downfall of West Bengal’s Communists, clearing the decks for the Trinamool Congress’s march to power with Mamata Banerjee at the helm. After 22 months, land is still such a touchy issue for Mamata that any partyman talking out of turn about land is sure to be grounded, as the fate that befell senior Trinamool MP Saugata Roy illustrates.