An illegal immigrant in India is a person residing in    the country without an official permission as prescribed by    relevant Indian law. Those who are explicitly granted    refugee status do not fall under this    category.  
    No reliable numbers on illegal immigrants are currently    available.  
    2001 India Census Gives information about Migrants but not    exclusively Illegal Immigrants. Per 2001 Census Bangladeshi form the largest group of    migrants in India followed by Pakistan.[1][2]  
    As per 2001 census there are 3,084,826 people in India who came    from Bangladesh[1] No reliable    numbers on illegal immigrants are currently available.    Extrapolating the census data for the state of Assam alone gives a figure of 2    million.[3][4]    Figures as high as 20 million are also reported in the    government and media.[5][6] Samir Guha Roy of the Indian    Statistical Institute called these estimates "motivatedly    exaggerated". After examining the population growth and    demographic statistics, Roy instead states that while a vast    majority are illegal immigrants, significant numbers of    internal migration is sometimes falsely thought to be    immigrants. An analysis of the numbers by Roy revealed that on    average around 91000 Bangladeshis illegal crossed over to India    every year during the years 1981-1991[7]  
    The trip to India from Bangladesh is one of the cheapest in the    world, with a trip costing around Rs.2000 (around $30 US),    which includes the fee for the "Tour Operator". As Bangladeshi    are cultural similar to the Bengali people    in India, they are able to pass off as Indian citizens and    settle down in any part of India to establish a far better    future than they could in Bangladesh,[8] for a very small price.    This false identity can be bolstered with false documentation    available for as little as Rs.200 ($3 US) can even make them    part of the vote bank.[7]  
    Most of the Bengali speaking people deported from Maharashtra    as illegal immigrants are originally Indian citizens from West    Bengal. Police would demand 2000-2500 from each of the detained    Bengali speaking people for their release. If they fail to pay    that amount, they are kept behind the bar for 1015 days    following which they would be taken to border and pushed into    Bangladesh.[7]  
    The Bangladesh Liberation War and    continued political and economic turmoil in Bangladesh in the    following decades forced some Bangladeshis to seek refuge in    India. During the Bangladesh Liberation War    at least 10 million Bangladeshis crossed into India illegal to    seek refuge from widespread rape and    genocide.[8] Most of them migrated to    the border states, particularly West Bengal and Assam.[4] This    issue became more visible after the 1991 census when patterns    of abnormally high growth rate of Muslims were observed in the    border states Assam and West Bengal. In 1991 census Muslim    population growth rates in these states were found to be much    higher than the growth rates of the local Hindu population even    after adjusting for the usual higher growth rate of Muslims    observed throughout the country.[3][4][9] See the    following tables for detail.[3][4][9][10][11][12]  
    There are estimated 50,000-100,000 Burmese Chin immigrants    residing in India,    mostly in the Indian state of Mizoram and a small number is found in Delhi.[13][14][15]  
    India has hundreds of thousands of people from Pakistan, living    illegally, according to one figure from 2009, it was above    7,700.[16]  
    By 2009, India had over 13,000 illegal immigrants from Afghanistan.[16]  
    In Assam, agitation against immigrants    started as early as 1979, led by All Assam Students    Union.[17] Their demand was to put a stop    on the influx of immigrants and deportation of those who have    already settled.[4] It    gradually took violent form and ethnic violence started between    Assamese and Bengalis, mostly Muslim. It eventually led to the    infamous Nellie massacre in 1983 due to a    controversy over the 1983 election.[18] In 1985    Indian Government signed the Assam accord with the leaders of the    agitation to stop the issue.[4][19] As per    the accord India started building a fence along the    Assam-Bangladesh border which is now almost complete.[20] However, Assam also has a large    number of genuine Indian Muslim Bengalis. It is difficult to    distinguish between illegal Bangladeshis and local Bengali speakers.[21] In    some cases, genuine Indian citizens have been    discriminated[4][22]    Allegations exist that nationalist parties such as the    Bharatiya Janata Party as well as    the Indian National Congress have    discriminated against Bengali-speaking Muslims.[23] On the other hand, in some    places reports of Bangladeshis being able to secure Indian    ration and voter identity cards have come out.[24][25]  
    After 1991 census the changing demographic patterns in border    districts became more visible.[3][4] It created anxiety and    tension in India throughout the nineties. Both    conservatives[26] as well as moderates[3] expressed concern on this    issue. The first BJP government came into power in 1998 and    subsequently ordered the construction of the Indo-Bangladesh barrier to stop    migrants and illegal trade along the border. It was planned to    enhance the already existing barrier in Assam and to encircle    West    Bengal, Tripura    and Mizoram as    well.[27][28][29]  
    The other Indian state affected by this problem, West Bengal,    remained mostly calm during this period. However Indian    newspapers reported that "the state government has reports that    illegal Bangladeshi migrants have trickled into parts of rural    Bengal, including Nandigram,[30] over the    years, and settled down as sharecroppers with the help of local    Left leaders. Though a majority of these immigrants became    tillers, they lacked documents to prove the ownership of    land.[30]"  
    The Government of Bangladesh has    denied India's claims on illegal immigration.[31][32]  
    After 2001 census the anxiety somewhat reduced when the growth    rates were found to have returned to near normal level,    particularly in West Bengal, thus negating the fear that there    was an unabated influx of migrants.[33][34] Although some concern remains.  
    Although Kerala is at a large distance from    Bangladesh(~2500km),Bangladeshi illegal migrants have    been moving to Kerala    owing to the high wages for unskilled and semi-skilled    laborers, and also the presence of sizable Muslim population in    the state. The Kerala police are reportedly finding it    difficult to check the influx of these Bangladeshi illegal    migrants.[35] Kerala State Intelligence    officials said they found that a large section of Migrant labourers in Kerala    claiming to be from West Bengal or even Assam were actually from Bangladesh.[36] Anti national activities have    been reported; the latest in which in August 2016, a    native of west Bengal was arrested for insulting the national    flag and he was later found to be an illegal immigrant from    Bangladesh. There is said to be major racket at the borders of    West Bengal and Assam with Bangladesh which provides illegal    migrants with identity cards.[37]  
    In 2005, a Supreme Court bench ruled Illegal    Migrants (Determination by Tribunal) Act (IMDT) as    unconstitutional while,[38] with reference to    the Sinha Report,[39]    maintained that the impact of the "aggression"    represented by large-scale illegal migration from Bangladesh    had made the life of the people of Assam "wholly insecure and    the panic generated thereby had created fear psychosis" in    other north-eastern States.[38] In August 2008, the    Delhi    High Court dismissed a petition by a Bangladeshi national    against her deportation. The High Court ruled that the illegal    Bangladeshi immigrants "pose a danger to India's internal    security".[40]  
    Apart from immigrants a large numbers smugglers regularly    cross    the porous border along West Bengal into India.[41] They mainly    engage in smuggling goods and livestock from India into Bangladesh to avoid    high tariff imposed on some Indian goods by Bangladesh    government.[41] Bangladeshi    women and girls are also trafficked to India and via India to    Middle East for forced labor and commercial sexual    exploitation.[42]    The Centre for Women and Children Studies estimated in 1998    that 27,000 Bangladeshis have been forced into prostitution in    India.[43][44] According to    CEDAW report, 1% of foreign prostitutes in India    and 2.7% of prostitutes in Kolkata are from Bangladesh.[45]  
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Illegal immigration to India - Wikipedia