Ulysses Klaue was a black market arms dealer, operating from a scrapyard on the coast of Africa, and an old acquaintance of Tony Stark. When Ultron came in search of vibranium, he tracked down Klaue. After transferring billions of dollars to Klaue's account, Klaue took note of Ultron quoting Stark and realized he was a creation of Stark. Ultron took offense and amputated Klaue's left arm as a punishment. As the Avengers arrive on scene, Klaue then ordered his men to open fire on both sides as he made his escape.
Klaue later used the money that Ultron gave him to develop a device mounted on what was his left arm.that was capalbe of producing blasts of sound. Klaue later took the name Klaw and went so for as to become an enemy of Black Panther and ally of the Masters of Evil.
Sound Converter: Klaw wears a prosthetic device composed of molybdenum steel which contains a miniature version of his sound converter machine. The artificial hand is attached to his sound/mass body by as yet unknown means. Klaw activates the circuitry of the device by pseudo-cybernetic commands.