Thanks to his intensive work, the so-called "ambassador conspiracy" was annihilated. He instructed his trusted two Chekists, Bujkis and Sprogis, to infiltrate the counter-revolutionary milieu where, under the identity of Tsarist officers, they were to gain the confidence of the conspirators. In Petrograd, Jan Bujkis met the British Embassy's military attaché Francis Cromie, who recommended him to Robert Lockhart.