As demonstrations over the war in Gaza have surged on campuses, around cities and in offices across the US in recent weeks, a visible tension has emerged between the desire for public protest and a fear of professional reprisals. On the Columbia University campus, where the latest spike in protests began on 17 April, demonstrators have worn masks and used blankets to block counter protesters from filming students. Protesters at a tent encampment at the University of Michigan handed out masks upon entry, and students there refused to give reporters their full names in case the school took punitive action...