Bahrain imposed sweeping restrictions on its Shiite community ahead of a major holiday commemoration, the latest in a string of curbs on minorities across the Gulf since the US-Iran war.

The crackdown emphasizes a point made recently by Semafor’s Gulf editor: The conflict’s most enduring legacy in the region, whose ruling monarchies are Sunni Arab, may be renewed tensions with Shiite populations because of perceived links to Shiite-majority Iran.

Any dissent now risks being recast as treason.

Manama recently stripped 69 Shiites and their relatives of citizenship, attempting to deport most to Iran, and have banned public mourning for Tehran’s late supreme leader; authorities in Kuwait, Qatar, and the UAE have also cracked down on alleged Iran-linked militants and sympathizers.