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Independence is important to intelligent decision making for two reasons. First, it keeps the mistakes that people make from becoming correlated. Errors in individual judgment won’t wreck the group’s collective judgment as long as those errors aren’t systematically pointing in the same direction. One of the quickest ways to make people’s judgments systematically biased is to make them dependent on each other for information.

In 1934, the KGB, The Soviet security intelligence agency, recruited three Cambridge University Students: Guy Burgess, Donald Maclean and Harold "Kim" Philby. Three years later, in 1937, two more were recruited: Anthony Blunt and John Cairncross; thus, creating the Cambridge Five.

“But Mr. de Zoet may pass through sea gate and away, over ocean. But I—all Japanese”—Ogawa listens to Hanzaburo and his friend’s conspiratorial grumbles—“prisoners all life. Who plot to leave is executed. Who leave and return from abroad is executed.