Chants of "Oh Jeremy Corbyn!" boomed around stadiums and music festivals, and the bearded politician took on the aura of a rock star.
But the lead-up to the 2024 general election has been a significantly more muted episode.
At a time when Tory voters appear to have deserted their party and the political battleground is closer to the centre-right, previous Corbyn supporters have been left politically adrift, feeling sidelined and ignored by the major parties.
For those swept up in the movement, 2017 was a time brimming with optimism and possibility, pushing back against the misery of a Tory government and a brutal regime of austerity that was driving millions into poverty.
"It felt like this amazing euphoria of suddenly the whole country had started to back Corbynism," said Gerard Corvin, who began canvassing for the party that year.
Denne historien er fra July 02, 2024-utgaven av The Guardian.
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Denne historien er fra July 02, 2024-utgaven av The Guardian.
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