The co-founder of Palestine Action, Huda Ammori, has won a historic legal challenge against the Home Secretary’s decision to ban the group under anti-terrorism laws, The Guardian reported Friday.

Proscribed last July, the group was categorized alongside organizations such as ISIS, making membership punishable by up to 14 years in prison.

This marks the first time a group has successfully challenged such a ban in court.

Three High Court judges ruled the proscription unlawful, citing “very significant interference” with freedoms of speech and assembly, and noting that then-Home Secretary Yvette Cooper’s decision was inconsistent with her own policy.

While the court acknowledged some of the group’s criminal property damage, it determined these acts did not reach the scale required to warrant a terrorism designation, suggesting general criminal law was sufficient.

Ammori hailed the “monumental victory,” arguing the ban was meant to protect arms manufacturers like Elbit Systems from costly disruption rather than address actual terrorism.

However, the ban remains in place temporarily to allow the government to appeal.

Current Home Secretary Shabana Mahmood expressed disappointment, stating she intends to fight the judgment to protect national security. The ruling leaves over 500 charged individuals—including veterans and clergy arrested for defying the ban—in legal limbo, as their charges may only be dropped if the proscription is officially quashed.