Aybar was also a member of the International War Crimes Tribunal which was founded by Bertrand Russell.
Bertrand Russell | Russell Crowe | Revolutionary Tribunal | Frederick Russell Burnham | Russell Simmons | Kurt Russell | Russell Brand | Ken Russell | Leon Russell | Rosalind Russell | Russell Street | Russell Mulcahy | Nipsey Russell | George Russell | Russell Street, Melbourne | James Russell Lowell | Russell Howard | Russell Drysdale | John Russell, 1st Earl Russell | John Russell | Jane Russell | International Criminal Tribunal for the former Yugoslavia | Willy Russell | Russell | Lillian Russell | International Criminal Tribunal for Rwanda | George Russell (composer) | Bill Russell | Russell Slade | Brenda Russell |
Duncan also presented testimony on what he believed to be American war crimes to the Russell Tribunal in Roskilde, Denmark in November 1967, where he was one of the first three former American soldiers to testify.
Hubbard suggested that CCI combine their efforts with Jane Fonda, Rev. Dick Fernandez of Clergy and Laymen Concerned about Vietnam (CALCAV), Mark Lane, and Donald Duncan (who had previously testified at the Russell Tribunal in Denmark).