Then a member of the Independent Labour Party (ILP), Maclean worked closely with other socialists in the Glasgow area, as part of the Red Clydeside movement.
[1] When many of his fellow ILP Clydesiders left the Labour Party, Maclean remained a Labour MP, associating for a time with the Scottish Socialist Party.
He was offered a seat in the House of Lords, but declined due to his socialist principles.
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