First, please come out of your regionalist and racist mindset.
Who gave you the idea that all Bengalis are communists? Communist scum exist in all countries and regions, not only Bengal.
What do you know about patriotism of Bengalis? Have you ever read the history of India's freedom struggle?
Please do not form opinions about communities just by the reaction of some cricket crazy fans for whom hero worship is bigger than supporting the Indian team. Such fans are there all over India, not just Bengal.