Alot of judgemental remarks from people who seem to have an anti left agenda,hardly impartial fair criticism
Mr Millar was a political activist long before he involved himself in folk music." Millar was part of an agitprop theatre group, the Red Megaphones, who were associated with the Workers’ Theatre movement. Littlewood was drawn to their brand of theatre and political activism which contrasted markedly with her experiences as a student at London’s prestigious Royal Academy of Dramatic Arts (RADA) and then at the Rusholme Repertory (in Manchester).

The term agitprop is a combination of ‘agitation’ and ‘propaganda’ and originates from Soviet Russia.

Agitprop theatre uses:

    political themes and satire
    direct engagement with the audience
    caricatures or ‘types’ rather than developed characters
    characters engaging in a debate to promote a message

It is often performed on the street and written quickly to reflect current affairs. Writing in 1936 Littlewood described how modern theatre should ‘be sufficiently dynamic and forceful to break down all the artificialities which clog the ordinary cardboard stage … [We must] destroy all the paraphernalia which litters and obscures the play. We must strip our stage of all that is superfluous’.[2] It is easy to see why the immediacy of agitprop theatre appealed to her.

The Red Megaphones performed political skits and satirical songs on the streets, in factory forecourts and for the dole queues outside the labour exchange. Pieces reflected daily news and covered local, topical issues. Audience members were encouraged to get involved in the action.

In late 1934 Ewan and Joan formed the company Theatre of Action, in association with the Workers’ Theatre movement. They were influenced by the struggles of inter-war Britain, by the union movements, by the strikes of the 1920s and by the ‘Means Test’ introduced in 1931. They were also affected by the rise of fascism across Europe. The man was a communist - the evidence is overwhelming." From the Guardian: "Left school at 14, political activist at 15, founded theatre troupe at 16, on MI5’s files at 17, godfather of British folk revival at 35" "Millar joined the young communist league shortly after his fourteenth birthday and remained a member until the 60's and publicly supported the party until his death."
https://www.jstor.org/stable/25472794?seq=1
You cannot separate the politics, theatre and folk contributions, they are all interlinked. The facts are a matter of public record and undeniable.