I wrote a piece on Momentum, kindly published by the Clarion, which they finally published early in October.
Momentum democracy: how the organisation ignore its own flawed rules
It looks at the untrammelled powers of the National Coordinating Committee, the lack of the on-line voting portal promised, the lack of clarity on whether non-members of the Labour Party were grandfathered into membership, the necessity for a national conference (with no powers), the unlimited delegation powers of the NCG to officers and committees and the constraints its aims, objects and ethics place upon it. I also talk about the lack of transparency in its IT and finances.
I hope you find it useful.
Power in Momentum