It has been revealed that Jacek Karpiński worked as a secret informant for the Służba Bezpieczeństwa since 1961. He received considerable financial rewards for his work, including foreign holidays with his wife sponsored by the state. Karpiński's work was mostly dedicated to collecting technological data. This was also stated by him to be the condition under which he is inclined to provide information. Karpiński was a valuable asset, having travelled extensively since the 1950s and possessing a wide range of international contacts. He provided the intelligence with a lot of useful information beginning with the international Expo in Leipzig in 1961. But the peak of his activity was reached during his trip to the United States, during which he amassed and passed an extensive amount of information on both the technological centres, but also personalities of American science and industry.