Five years ago this week a train derailed in Minot, North Dakota leaking thousands of gallons of toxic chemicals into the air. One person died and hundreds were treated for immediate health problems. The city’s six non-religious commercial radio stations—all owned by Clear Channel—never aired warnings for local residents. In a broadcast exclusive, we air the 911 tapes for the first time, and speak to Eric Klinenberg, author of “Fighting for Air: The Battle to Control America’s Media.” [includes rush transcript]