The definition is "the use of an interstate wire communication to further the scheme". Email and phone qualifies, and it does not need to play a crucial role i

The definition is "the use of an interstate wire communication to further the scheme". Email and phone qualifies, and it does not need to play a crucial role in the scheme to defraud, it only needs to be made in order to advance the scheme somehow; a single email exchange about the kickbacks with a vendor sales representative in another state might be sufficient push it from "normal" fraud to wire fraud.