PROSPECT HEIGHTS, Ill. (WLS) -- Federal agents gathered outside of a Prospect Heights apartment complex just before 10 a.m. Monday.

As the agents dressed in uniform walked on the property, numerous residents blew whistles and recorded video on their phones. The idea is to warn people that the agents are nearby and to document their actions.

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"They see somebody outside and they just take 'em. No questions asked. It's just done," said activist Aileen Lopez.

A sign outside the complex warns unwelcome visitors to stay away. But the agents paid it no mind.

It is unclear who they were possibly looking for, but a few minutes after 10 a.m., they took a man into custody. Friends said he does not live there but was stopping by to give a co

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