This article indicates that one or two former members of the “Orthodox Trotskyist” Socialist Action (SA) group are joining the ISP project.
It should be noted that in October 2019, SA suffered a split with the birth of a faction that challenged the "anti-imperialist" position in which Jeff Mackler trained SA.
Reading the story of this split by SA is a moment of joy for all Third Campists : Shachtman's demon dared to enter the temple of Cannonist orthodoxy!
See : https://socialistaction.org/2019/10/22/anatomy-of-the-recent-split-in-s…
This faction took positions on Syria, Iran, Venezuela and Nicaragua which emphasized the need to support first the
workers of these countries against the bourgeoisie, his state, even disguised as "anti-imperialist".
They formed a new group named Socialist Resurgence (https://socialistresurgence.org/). The curious will appreciate the positions adopted by these activists.
I do not know if the people mentioned at the beginning of the article stayed with their former fractional comrades or if they left them for ISP