In July, a swarm of unmarked cars bearing agents from the Department of Homeland Security suddenly appeared in the lot of the National Museum of Puerto Rican Art and Culture in Humboldt Park.

Local elected officials and community members called the visit a scare tactic; President Donald Trump’s officials said they’d been staging an operation related to a narcotics investigation.

But the agents’ presence outside a Chicago cultural institution sparked a panic that spread across city museums and event spaces as they weighed how to protect their staff and audiences.

On Friday, a group of museum leaders met for a two-hour training at the Puerto Rican museum hosted by the nonprofit Latinos Progresando. While reports indicate that senior U.S. Border Patrol official Greg Bovino left Chicago las

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