The legal battle between activist groups and the city of Chicago over planned protests at the Democratic National Convention took another turn on Tuesday with the filing of a preliminary injunction. WBBM's Mallory Vor Broker reports.

Photo by Scott Olson/Getty Images

<p>The legal battle between activist groups and the city of Chicago over planned protests at the Democratic National Convention took another turn on Tuesday with the filing of a preliminary injunction. WBBM's Mallory Vor Broker reports.</p>
<p>Photo by Scott Olson/Getty Images</p>

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