When police in Kent, United Kingdom, arrested American peace activist Max Geller in 2021 for chaining himself to a van parked in front of an Israeli-owned weapons factory, he knew he might be jailed and face charges for his protest.

What he didn’t realize was that he could be hit with U.S. sanctions five years later for his past ties to a so-called terrorist organization.

The Trump administration on Wednesday announced sanctions against the U.K.-based anti-genocide protest group Palestine Action, which organized the 2021 demonstration and dozens of subsequent actions at U.K. factories owned by Israel’s largest weapons manufacturer, Elbit Systems. The goal, in the U.S. government’s words, is to “protect Americans from the risks posed by far-left terrorism.”

“A major threshold has been crossed,” said Geller, who was previously Palestine Action’s spokesperson but left the group in 2025, when the British government made membership punishable by 14 years in prison. “They’re now treating regular Americans who want to effectively oppose genocide as terrorists.”

The specific parameters of the U.S. sanctions are not yet clear, but Treasury Secretary Scott Bessent pledged the government would “continue to cut the financial lifelines of these groups until they are eliminated.” Sanctioned groups and individuals cannot receive funds, goods, or services from American people or business — meaning they’re cut off from both the U.S. banking system and from any donations from Americans who might want to support them. They can have an isolating global effect: Financial institutions outside the U.S. that do business with American companies are often hesitant to affiliate with sanctioned individuals.