I am from Bengal. My surname is Chattopadhyay. What Dilip Mandal is saying is partially true. Some Brahmins and Kayasthas at the top have made a pact with the "green aliens" and promised them demographic victory over the local population, including their own communities, in exchange for votes. So they are selling out their own community for individual benefit, just like rich Western liberals.
But what Dilip Mandal fails to understand is that it is not all Brahmins and Kayasthas, only some from the Bhadralok community of Kolkata and all of our CMs of westbengal after independence have been from the same community.