The Left parties on Thursday met Prime Minister and apprised him of the alleged attacks on Left workers by the ruling Trinamool Congress in West Bengal . Later, speaking to reporters, Left Front chairman Biman Basu said Left Parties have informed Dr Singh that the Trinamool Congress headed government was using terror tactics in the state and damaging democracy.The Left delegation asked the Centre to monitor all these developments.In a memorandum handed over to the Prime Minister, Basu said the Dr Singh assured he will do whatever he can. Mr. Basu was accompanied by Left MPs, state legislators and other party leaders