West Bengal Chief Minister Mamata Banerjee spearheaded a huge protest march in Kolkata on November 4 against the ongoing Special Intensive Revision (SIR) of electoral rolls. The Chief Minister, who is also the Trinamool Congress (TMC) supremo, accused the Bharatiya Janata Party (BJP) and the Election Commission (ECI) of orchestrating a 'silent, invisible rigging' through the process.