TULSA, Okla. (AP) — A Tulsa man and three U.S. Postal Service carriers have been charged with participating in a methamphetamine drug conspiracy, federal prosecutors said Tuesday.

A federal grand jury in Tulsa indicted Kamau Jahi Williams, 42; Erick Scott, 49; Christine Conner, 54, all of Tulsa; and Shawn Boike, 46, of Skiatook, with drug conspiracy, acting U.S. Attorney Clint Johnson said in a statement. The defendants made initial federal court appearances Tuesday.

Prosecutors allege that Williams orchestrated the conspiracy with the other three, all postal workers at the Apache Street Post...