The U.S. Justice Department said seven people were arrested on charges of trafficking in endangered black rhinoceros horn over the past week in Los Angeles, New York, and Newark, N.J. Special agents of the Fish and Wildlife Service and Immigration and Customs Enforcement (ICE) made the arrests and have issued search warrants in five states as part of “Operation Crash,” a multi-agency effort to investigate and prosecute those involved in the black market trade of endangered rhinoce...