"Bevin left school at 11 to take a job as a farm boy, and was subsequently a kitchen boy, a grocer's errand boy, a van boy, a tram conductor and a drayman before, at the age of 29, he became active locally in Bristol in the Dock Wharf, Riverside and General Labourers' union."
And was Foreign Minister in the Atlee government, ardent ant-Soviet, arguably one of the founders of the Atlantic alliance and many other achievements. That route is pretty much closed these days.
My own personal favourite is William Robertson - who was Chief of the Imperial General Staff from 1916-1918. He went from a private soldier to that lofty position. Richard Holmes points out that an equivalent rise would be impossible today - even with much smaller forces to command.
These people were successful because they were good - not on "merit" as is usually defined.
See, e.g., http://www.criticalreview.com/2004/pdfs/cardiff_klein.pdf.
Also, I find it a bit ironic that you call for taking lessons from 20th-century mass-movements considering that the article echoes others similar to it -- written by scientists -- around the same time of the Bolshevik revolution, and served to justify other movements with no better record than that of communism.
I don't think sociology is completely hopeless but given its track record so far I would sooner expect intelligence (and empathy, willpower, etc.) augmentation to cure whatever problems plague society than any attempt at "institutional change".
But speaking of track records, I think that the record of those who have called for "institutional change" and got us civil rights, education and healthcare is far better than that of so-called scientists who have favored "applied artificial Darwinism" and advocated for eugenics programs.
[1] I'm not a native English speaker -- I don't know if you are -- but you're the first I've seen to write the names of academic disciplines in single-quotes. Is that a thing?