Then the part they elided from d comes into play:
"unless such communication is intercepted for the purpose of committing any criminal or tortious act in violation of the Constitution or laws of the United States or of any State."
Unfair trade practice (and other things count here) since it doesn't have to be criminal, only a civil violation :)
Here it is saying it’s illegal unless you are an official acting under color of law and there is one party consent