From Singur to Sandeshkhali: ‘Land grab’ that brought Mamata Banerjee to power, now challenges TMC in Bengal Singur and Nandigram upheaval led to Mamata Banerjee's rise to power in West Bengal, ending CPI(M)'s 34-year rule. Recent Sandeshkhali turmoil, involving land grab and sexual assault allegations, could challenge TMC's governance.