Is undocumented immigration from Bangladesh a serious national security threat?

Undocumented migration from Bangladesh into India, particularly Assam and West Bengal, has been a politically sensitive issue for decades, tied to disputes over jobs, land, electoral rolls, and cultural change in border regions. The most consequential government response so far was Assam's National Register of Citizens (NRC), updated through a Supreme Court-monitored process and finalised in 2019, which excluded around 1.9 million of the state's roughly 33 million residents from the citizens' list, leaving them at risk of statelessness pending appeal.

Concerns about undocumented migration from what is now Bangladesh date back to before Partition, but intensified after the 1971 Bangladesh Liberation War, when millions fled across the border, some of whom never returned. The Assam Accord of 1985, signed after a six-year movement led by Assamese student groups, set 1971 as the cutoff date for determining legitimate residency, a framework that ultimately produced the 2019 NRC update.

The final NRC excluded nearly 1.9 million people, a large share of them from linguistic and religious minority communities, the poor, and groups facing documentation difficulties such as women married young or those displaced by river erosion. The separate Citizenship Amendment Act (CAA), passed in 2019, created an accelerated citizenship pathway for non-Muslim religious minorities (Hindu, Sikh, Buddhist, Jain, Parsi, and Christian) who arrived from Pakistan, Bangladesh, and Afghanistan before 2014, a law widely criticised for using religion as an eligibility criterion and seen by many critics as designed to soften the NRC's impact for non-Muslims specifically.

• Supporters of stricter enforcement argue undocumented migration places pressure on land, jobs, and public services in border states, and that unresolved residency status creates governance and security gaps.
• Some officials have linked undocumented migration to broader concerns about demographic change in sensitive border regions, framing it as a long-term strategic issue, not just a law-and-order one.
• Supporters argue every sovereign country has a legitimate interest in knowing who resides within its borders and on what legal basis, independent of the specific country of origin involved.

• Critics argue the NRC process was deeply flawed in practice, excluding many genuine Indian citizens, particularly the poor and those lacking generational paperwork, rather than reliably identifying undocumented migrants.
• The CAA's religion-based eligibility criteria, critics argue, reveal that the underlying concern is demographic and religious composition as much as documentation status, raising constitutional equality concerns under Article 14.
• Nearly two million people facing potential statelessness, critics argue, is a humanitarian and administrative crisis disproportionate to the scale of the original immigration concern, especially given the lengthy and costly appeals process facing those excluded.

Citizenship verification exercises of this scale are unusual globally; most countries manage undocumented immigration through border enforcement and case-by-case status determination rather than a single nationwide register-and-exclude process applied retroactively to existing residents. The closest comparisons, large-scale deportation and detention programmes in some Gulf states or stricter European asylum systems, generally apply to recent arrivals rather than long-settled populations, which is part of what makes Assam's NRC, applied to people who may have lived in India for decades, a particularly contested case internationally.

The BJP has been the most consistent advocate for both the NRC process and the CAA, framing them as overdue corrections to decades of unchecked migration. The Congress and most regional and opposition parties, along with civil liberties groups, have criticised the NRC's implementation and the CAA's religious criteria specifically, while not uniformly opposing the principle of identifying undocumented residents. Assam-specific regional parties have engaged with the issue on more local terms tied to the 1985 Assam Accord.

This question sits heavily on the Nation axis (border security and demographic concern) with an Authority axis component (state power to determine and revoke residency status), and intersects closely with the Citizenship Amendment Act debate covered separately on this site.