Since many years the Central Office has been cooperating with similar authorities from abroad, which also deal with NS crimes, especially with the Human Rights and Special Prosecutions Section (HRSP), former Office for Special Investigations (OSI), a unit within the Criminal Division of the United States Department of Justice, with the correspondent department of the Canadian Department of Justice and with the Commission for the Prosecution of the Crimes against the Polish nation (in IPN). Moreover, a legal assistance correspondence with the Italian legal authorities is still being maintained today, as well as numerous further countries of the European Union.
