What a Mistrial Means for The Freddie Gray Case Listen Download Embed Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email April 29, 2015: Hundreds of demonstrators filled Union Square in support of Freddie Gray protesters in Baltimore. Attempts to march resulted in more than one hundred arrests by NYPD. ( A Katz / Shutterstock ) Produced by Ellen Frankman Produced by PRI and WNYC