surreptitious russian

• тайко́м

  secretly, in secret, surreptitiously, by stealth, on the quiet, on the sly

• перлюстрируемый

  being censored, being intercepted, being subjected to surreptitious inspection of correspondence

• подки́дывающий

  tossing, throwing up, flinging up

  planting (surreptitiously), slipping (in), covertly placing

• подсо́вывавший

  who was slipping in, who was foisting, who was surreptitiously placing