http://libraryqxxiqakubqv3dc2bend2koqsndbwox2johfywcatxie26bsad.onion/library/andy-durgan-international-volunteers-in-the-poum-militias
For instance, Marcel Pivert’s Revolutionary Left faction in the SFIO also had close links with Nin and Maurín’s party, as would a variety of semi-Trotskyist groups. Once the war started, the POUM appealed to the IBRSU for support.