The Green party of England and Wales faces a calculated stress test this weekend. A motion declaring "Zionism is racism" topped the members' ballot for debate at the Brighton conference — propelled in part by Greens for Palestine (GfP), a group with no formal party affiliation that has openly urged supporters to join the party specifically to vote the motion through. If passed, members who support Zionism could face internal discipline for racism, effectively making a contested political position a disciplinary offence. The architecture of the campaign is worth mapping precisely. GfP is led by Lubna Speitan, who co-authored the motion and has rejected leadership-backed amendments to soften its language. GfP has collaborated with the Anti-Zionist Movement (AZM), a more militant outfit whose key figure is David Miller — a former Bristol University academic sacked for his Israel criticisms, later vindicated by an employment tribunal that ruled anti-Zionist beliefs are protected. Miller now hosts a show on Press TV, Iran's state channel, and has publicly argued that Zionist "infiltrators and subversives" have penetrated UK political parties, media, finance, law, and entertainment. The timing is not incidental. The Holborn and St Pancras byelection — Keir Starmer's former seat — falls days after the conference vote. Green party leader Zack Polanski is the candidate. He declared himself anti-Zionist and called Zionism a form of racism, but has backed amendments to tone down the motion. That straddling position has satisfied neither faction: GfP sees the amendments as betrayal, while senior Greens say Polanski has failed to provide leadership on the issue. The institutional vulnerability here is structural, not incidental. The Greens are a small-membership party whose democratic processes — open ballots, low thresholds for conference motions — were designed for grassroots participation. Those same mechanisms become vectors for capture when external groups mobilise sign-ups around a single issue. The party's own spokesperson acknowledged the mobilisation attempt while insisting "the vast majority of members joined prior to a specific attempt at mobilisation." Jewish members have privately signalled they may leave if the motion passes. This is the real extraction: whatever one's position on the Israel-Palestine conflict, converting a contested geopolitical stance into an internal disciplinary standard narrows the party's coalition and creates a purity test that functions as expulsion by other means. The motion doesn't just state a position — it creates enforcement machinery. Miller's rhetoric about "3,000 or 4,000 Zionist organisations" to be dismantled and Zionist "infiltrators" across British institutions carries unmistakable echoes of conspiratorial antisemitic framing, even when delivered under the legal protection of anti-Zionist belief. The party says it "does not support the views of the AZM," but the collaborative infrastructure between GfP and AZM — shared events, shared social media campaigns, Speitan speaking at AZM meetings — makes that disavowal operationally hollow. The deeper question is whether the Greens' democratic structures can distinguish between genuine grassroots energy and organised entryism. Labour faced a parallel test during Corbyn's leadership, with different actors and different outcomes. The Greens' smaller scale makes them more vulnerable: fewer members means fewer sign-ups needed to shift a ballot, and the party's ideological openness makes boundary-policing culturally difficult. The byelection will be the first measurable signal of whether this controversy costs votes or mobilises them.
