Tear gas and flash bangs were deployed to disperse crowds protesting immigration raids in downtown Los Angeles after dozens of people were arrested by federal immigration agents Friday, including a prominent union leader.

A local immigrant rights organization said more than 45 people were detained in the operations, which were described as “random sweeps.”

Federal immigration authorities carried out enforcement activities at several locations in Los Angeles on Friday, with some clashes breaking out as crowds gathered outside a warehouse and other locations across the city to protest the activity.