There have been numerous attacks by Taliban infiltrators embedded within the Afghan police and Army in the past year, suggesting widespread infiltration of the government's forces by the insurgents.
The Taliban have in the past claimed attacks by disgruntled police and soldiers as planned shootings by infiltrators.
Afghan forces have also suffered badly from insider attacks, with infiltrators gunning down and poisoning police officers and soldiers.
"The infiltrators are going to reach the Promised Land but they will only see it through bars".
They take any sign of planning or technical skill as proof of the involvement of infiltrators from Pakistan or Bangladesh.
It has used force against its citizens and simultaneously accused infiltrators of dressing up as high-ranking officials and ordering forces to shoot.
Bitterness runs deep, notably over mass graves containing thousands of unidentified bodies officials claim they were Pakistani militant infiltrators killed in battle; furious residents retort that many, in fact, are murdered local Kashmiris, and demand DNA tests to prove it.Thus any stability feels tentative.
Mr Modi, in Assam and West Bengal, has often inveighed against such migrants and on May 4th vowed to send back "Bangladeshi infiltrators" (code for Muslims) while welcoming "refugees" (Hindus).
Initially lauded as welcome refugees from the miseries of capitalism (and as useful specialists who might help replicate the bits of it that worked, such as factories) from 1935 onwards they became enemies of the people, infiltrators and spies.
The firing over the line of control was seen by India as a device to provide cover for infiltrators.
The breach also made Israel's border with Egypt, which is 255km (158 miles) long and in many places has no fence, vulnerable to infiltrators.
