Last week, we delved into story of how the Tennessee Valley Authority, which started out as a public institution, ended up acting like a private for-profit company, and the lawsuit that attempted to finally bring the TVA to its heel. Today, Montana Public Radio’s podcast The Wide Open tells the story of a different lawsuit against the TVA that had even bigger consequences. In the 1970s, the fight to save a tiny fish called the snail darter turned the Endangered Species Act from a minor bit of federal law into the most powerful and controversial piece of environmental le...