BIGOT and crosswords

A 'BIGOT' list is a list of personnel possessing appropriate security clearance and who are cleared to know details of a particular operation, or other sensitive information.
More information on the Wikipedia page .
This usage relates to events in World War II.
There were various 'almost leaks' and breaches - of which the most peculiar occurred with various of the crosswords in the London Daily Telegraph newspaper, where a number of codewords were given as answers to clues. The crossword setter, a schoolmaster, was arrested, but on investigation found to be innocent: it was eventually revealed that he had asked his pupils to provide ideas for crossword clues, and some of them had been listening to soldiers' conversations.
There are a number of articles on the subject, including the National Geographic article, the page Historic UK, and point 2 on : most repeat the same information. The Wikipedia page is .
See also D-Day carrier pigeon cipher
Category:Reference
Category:20th century