Nigeria, Sept. 1 -- In recent weeks, an unsettling trend has quietly unfolded: the United States Embassy in Nigeria has begun revoking valid visas previously issued to Nigerian citizens. This is not rumour or speculation. Dozens of affected Nigerians - professionals, entrepreneurs, and frequent travellers - have received formal letters instructing them to submit their passports at the consulate in Lagos or Abuja, only to have their visas unceremoniously canceled.

What makes this development even more alarming is the veil of silence surrounding it. I have personally reviewed at least eight such cancellation letters. The notices cite "Title 22, Code of Federal Regulations, Section 41.122" as the legal basis, vaguely stating that "new infor...