What's the Kennection? #194

What U.S. city was run by Mayor Tommy Carcetti on HBO's The Wire?

What instrument did Django Reinhardt revolutionize in jazz, despite having lost the use of two of his fingers in a 1928 fire?

What U.S. navy cruise missile is named after a Powhatan Indian weapon from colonial times?

In 1816, Mary Sawyer of Sterling, Massachusetts, inspired poets when she smuggled what pet animal into her school classroom?

What martial art will make its Olympic debut, appropriately enough, at the 2020 Tokyo games?

What's the "Kennection"?