Are you having your day dream on 20 million illegal immigrants!!! That is around 13% of the total population of Bangladesh n if it is really a fact then majority of the people would have aware of them as most of the people`s relative would have live in India... But it is not the case. I personally do not know any one who is living in India illegally... Like many other people. but we know a portion of hindus has been lured to go India with all their wealth from bangladesh with a dream of much better life but ironically they are now poorest of the poor. N why should people go to poorest region like NE India and WB then their own country. If any one go beyond Kolkata, They will find a backward region of WB. Bihar which is poorest then sub saharan africa. All these hoax of illegal Bangladeshi has been raised to discriminate against the bengali speaking muslim n to term them as illegal. It is quite common now muslim at least bengali speaking people are on its way to become majority in Assam where muslim made up around 35% n benagli speaking people made up 40-45%. This is quite common for the parties which has no chance of win to try to get some attention by raising this illegal immigrant fuss n this party is mainly BJP which has no chance of win in WB and NE india and run by radical extremist hindus.
This is quite unfortunate that all these bhartis has no brain to think logically what is truth and what can be reality ... when from 1971 population of Bangladesh increased exponentially and no where there were sign of decrease due to illegal migration.
Population of Bangladesh from 1971-2009:
World Development Indicators (subset) - Google Public Data Explorer
N those who cross border are mostly smugglers n farmers in the border area. In which case smugglers are rich enough n they do not go to India for money or better living but mainly to buy cows at a dirt cheap rate from the dirt poor people in the bordering area and bring the cows to bangladesh by giving bribe to the BSF.
If you still believe this hoax of 20 million illegal immigrants .. you should ban this worthless BSF for good for not able to stop crossing 20 million people means 1500 people per day illegally for the last 40 years.
Grow up bhartis do not remain naive and fall in to the trap of propaganda by the extremist hindu politicians...