| FUCHS | Klaus ___, physicist who passed atomic secrets to the Soviet Union (5) |
| ROSENBERG | Julius ... was executed for revealing atomic secrets to the Soviets |
| KINSKI | Klaus ___, actor who played the title role in 1979 film drama Woyzeck (6) |
| ROSEN | Nathan ___, physicist who collaborated with Einstein on a theory of wormholes |
| DAGUERRE | Louis ___, physicist who invented the first practical process of photography |
| FARADAY | Michael _; physicist who discovered electromagnetic induction (7) |
| 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) |
| DIRAC | Paul ___, physicist (5) |
| SCENE | Reportedly the whole secret to its function (5) |
| NOONE | Who to tell a secret to, presumably |
| 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 |
