Keir was a Fabian society member.
https://fabians.org.uk/on-the-horizon/
Extract for those who don’t like to click links:
Every single Labour prime minister has been a Fabian and if Labour wins in July Keir Starmer will join their ranks. Keir was a Fabian before he was elected to parliament, and served on our executive committee. In 2021, he wrote The Road Ahead, a Fabian pamphlet setting out his vision of a fairer, more secure and prosperous Britain, built on Labour values.
The Fabian Society has helped shape Labour’s policy programme in the run-up to this election. Last Autumn we published Plans for Power: Fabian ideas for transforming Britain, which compiled some of the most important ideas the society has developed and championed in recent years. It is a ‘mixtape’ of our best proposals, from early years to pensions and from the future of work to public service reform. With Labour in power, they could become reality.
Wiki Fabian definition: The Fabian Society (/ˈfeɪbiən/[1]) is a British socialist organisation whose claimed purpose is to advance the principles of social democracy and democratic socialism via gradualist and reformist effort in democracies, rather than by revolutionary overthrow.[2][3] The Fabian Society was also historically related to some of the furthest left factions of radicalism, a left-wing liberal tradition.[4][5][6]
If you look at this link you will see who is a Fabian in Labour:
https://www.gov.uk/government/publications/list-of-ministers-interests/list-of-ministers-interests-may-2025-html
You will note despite the Fabian society saying Starmer is another Fabian PM, it’s not on his declared interests. I assume he left and made sure he didn’t meet the requirements so he didn’t need to declare it.
The old emblem for the Fabians was a wolf in sheep’s clothing - take of that what you will! A quick google will show you the emblem. No surprise they are doing what they want without mentioning the majority of it in their manifesto.