Tuhia he haere tonu mo tenei whitianga - Ko te Rōpū Kaimahi (WP) he rōpū Trotskyist Tuatoru Camp i te United States. I whakatūria i te Paenga-whāwhā o te tau 1940 e ngā mema o te Socialist Workers Party nāna i whakakāhore te whakaekenga a te Soviet o Finland
me te whakapono a Leon Trotsky ko te USSR i raro i a Joseph Stalin he mahi noa iho, he "tino kaimahi kino". Ko Max Shachtman, ko ia te kaiarahi o te roopu hou, ko Hal Draper, ko C. L. R. James, ko Raya Dunayevskaya, ko Martin Abern, ko Joseph Carter, ko Julius Jacobson, ko Phyllis Jacobson, ko Albert Glotzer, ko Stan Weir, ko B. J. Widick, ko James Robertson, ko Irving Howe. Ko nga kaupapa o te roopu e kiia ana ko "Shachtmanite".