Part Two. Pre-Trial Proceedings
Section VIII. Preliminary Inquisition
Chapter 22. Preliminary Investigation
Article 166. Protocol of an Investigative Action
9. If it is necessary to provide for the safety of the victim, of his representative and witness, of their close relatives, relations and their near and dear persons, the investigator shall have the right not to supply the data on these persons in the protocol of the investigative action, in which the victim and his representative or witness have taken part. In this case, the investigator with the consent of the public prosecutor shall pass the resolution, in which the reasons for the adoption of the decision on keeping a secret about these data, the pseudonym of the participant in the investigative action and a sample of his signature which he will be using in the protocols of the investigative actions performed with his participation. The resolution shall be put into an envelope, which shall be sealed and enclosed to the criminal case file.
National judicial procedures protecting witnesses from identification – witness protection
EDIT.