NATIONAL Yechury takes a dig at Advani on Nandigram December 19 , 2007 00:00 IST Kanwar Yogendra SHIMLA : The CPI(M) on Tuesday questioned the BJP over its opposition to the tough measures taken by the West Bengal government against the Maoists at Nandigram where they had set up a “ liberated zone . ” CPI(M) leader Sitaram Yechury was reacting to the reference made by BJP leader L.K. Advani during his public meetings here .