| 1 | They were forced to suspend their espionage activities after their identities were compromised. | |
| 2 | Donovan believed in using whatever tools came to hand in the "great game" of espionage-----spying as a "profession. | |
| 3 | As secret policeman and chief of both domestic and foreign espionage, he knew the value of human-intelligence. | |
| 4 | Open-source spying does have its risks, of course, since it can be difficult to tell good information from bad. | |
| 5 | In contrast, Chinese intelligence agents steer clear of people who are vindictive, since the agents believe they may become volatile and explosive. |
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