This thread from Tom cuts through a lot of stuff and is a good explainer of why what is happening in Labour has broader democratic implications.

As an historian of the Labour Party I would add that the Labour right has changed significantly since the mid-1970s... https://twitter.com/shirleymush/status/1293813419527806977

...the Labour Right was functionally split by 1977 between those who would ultimately end up in the SDP (includiny many Campaign for Labour Victory people) and those Croslandites (diminishing in number) who did not agree with the direction of travel members of CLV were taking...

Though Crosland ultimately fell in line with Callaghan on the first of these, there are two key moments here, the first being when alongside Benn he opposed in Cabinet the IMF cuts package...

...The second was when Susan Crosland after her husband's death attacked those on the Labour right who sought to shift the focus away from equality.

The contemporary Labour right cannot lay claim to a meaningful historical tradition before the 1980s. It is a neoliberal entity.