There is mounting evidence that passengers with valid visas and travel documents, including foreign work permits, are being stopped from boarding flights. What began as a crackdown on human smuggling after back-to-back Greece boat tragedies has mutated into a sweeping exercise of unchecked authority. Instead of targeting criminal networks, immigration desks appear to be targeting ordinary travellers.

In Karachi alone, dozens of passengers were recently stopped in a single sweep. Lahore has seen similar episodes. Chambers of........

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