It's just multiple caucuses that call themselves Marxist, and use it to direct their ideas for how DSA should organize. For example there's the emerge caucus and Bread and Roses caucus (probably the most organized one).

There's a few national marxist caucuses and groups in dsa that I know of

https://communistcaucus.com

https://reformandrevolution.org

https://breadandrosesdsa.org

https://classunity.org/

https://twitter.com/revpower_dsa

These are the local chapter communist caucuses I know of

https://dsaemerge.org

https://redstarsf.org

https://redcaucus.org