GRU agents in Zagreb 1941-1945

[Dr Eisvogel]

Dear all,

could anybody provide me with a source that would confirm that any of the following people were working for GRU?

If not, is there any possibility that they worked for NKVD, Comintern or any other Soviet intelligence service?

1.) Pavle Bastajić
2.) Josip Kopinič known as Vozduh => http://hbl.lzmk.hr/clanak.aspx?id=9972
3.) Stela Kopinič
4.) Ivan Krajačić known as Stevo => http://hbl.lzmk.hr/clanak.aspx?id=10674
5.) Ivan Srebrenjak known as Antonov => shot on May 21st 1942 by Croatian police
6.) Franciska Srebrenjak-Klinc
7.) Urška Zalter

Best regards,
Eisvogel