At least in Indiana.
In the United States, federal law defines "copyright infringement" in Title 17, United States Code, and state law defines "theft". For example, in the State of Indiana, Indiana Code 35-43-4 defines the crime of "theft" as "knowingly or intentionally exert[ing] unauthorized control over property of another person, with intent to deprive the other person of any part of its value or use". In turn:
a person's control over property of another person is "unauthorized" if it is exerted: [...] by transferring or reproducing:
- (A) recorded sounds; or
- (B) a live performance;
without consent of the owner of the master recording or the live performance, with intent to distribute the reproductions for a profit."
So yes, even pedants should recognize that some copyright infringements are considered theft. If you can come up with analogous laws in other U.S. states, please post the details in comments.