 Although the KGB was not familiar with the authors, they soon discovered that Arzhak, the author of "This is Moscow Speaking", was the pseudonym of Yuli Daniel, and that Tertz was the pseudonym of his friend Andrei Sinyavsky.Both writers were placed under round-the-clock surveillance and their apartments were secretly searched.Information was also gathered from Sinyavsky and Daniel's colleagues acting as informants as well as KGB agents posing as neighbors' relatives.