Proxy-based perturbations for correcting algorithmic harms.
Published

October 6, 2026

Zines · No. 1 · October 2026

Test-Time Collective Action

Proxy-based perturbations for correcting algorithmic harms.

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Cover: a hand-drawn cat sitting beneath labels reading cats and dogs, with the title Test-Time Collective Action. Page 2: a photo app that labels cats as dogs, a quality-of-service harm. Who fixes this when platforms won't? Page 3: what Algorithmic Collective Action is, drawn as a collective of users planting a paw-mark signal in their photos. Page 4: the four steps of ACA, and the catch that users can't make the platform retrain. Page 5: a two-by-two grid placing this work in the literature, across platform or users and training or test. Page 6: the four steps of test-time collective action: pool queries, build a proxy, create one perturbation per class, apply it. Page 7: experimental results on CIFAR-10, CIFAR-100 and FairFace. Page 8: limitations, a note on simplifications, and a QR code for the paper. References, grouped by zine page. The PDF has them as selectable text.