Leaders of Left parties, who have strongly opposed the implementation of the Indo-US nuclear deal, have started receiving "death threat" mails.

Four top Communist leaders -- Prakash Karat and Sitaram Yechury (CPI-M), A B Bardhan and D Raja (CPI) -- have received "death threats" by mail for stopping the Congress-led UPA Government in going ahead with the nuclear deal and "harassing" Prime Minister Manmohan Singh's [Images] cabinet.

Sources said, the letter written in "incorrect English" by one Vinay Kateri from Mumbai has accused the Left leaders of "hijacking" national interests and warned them against "behaving like terrorists."

The writer also accused them of suffering from "anti-American virus" and said "people of this country are tired with their ... behaviour and harassing the government for the last four-and-a-half years."