| FUCHS | Klaus ..... , physicist who passed atomic secrets to the Soviet Union (5) |
| ROSENBERG | Julius ... was executed for revealing atomic secrets to the Soviets |
| KLAUS | Physicist convicted in 1950 of passing information to the Soviet Union about the development of the atomic bomb in the US (5,5) |
| WATEN | Born in Russia and growing up in rural WA, whose account of a visit to the Soviet Union was From Odessa to Odessa: The Journey of an Australian Writer (1969) |
| GULAG | Name given to the Soviet Union's labour camps. (5) |
| PANAM | This airline began service to the Soviet Union, July 15, 1968 |
| NIELS | Bohr who advocated sharing atomic secrets |
| LOOSE | Like the lips of someone you probably shouldn't tell secrets to |
| KLAUSFUCHS | German-born physicist who, in the 1940s, gave secret American, British and Canadian atomic research information to the Soviet Union (5,5) |
| NOONE | Who to tell a secret to, presumably |
| SCENE | Reportedly the whole secret to its function (5) |
| KNOWS | It's no secret to all, said snoop. (9,5) |
| CEASE | An outside chance for a top secret to come to an end |
| SUGAR | The secret to sweet and sour chicken: Pineapple and vinegar make it sour, but ___ makes it sweet |
| LEAKER | One who discloses government secrets to the media |
| KIM | India-born English double agent who defected to the Soviet Union in 1963 (3,6) |
| GOLDMAN | Emma ____, anarchist deported by the USA to the Soviet Union in 1919 |
| BURGESS | Guy, double agent who defected to the Soviet Union in 1951 (7) |
| IDIOTS | "Useful __," how Lenin is said to have described Western visitors to the Soviet Union (6) |
| LETON | Divulge (secret to) |
