DOC (Disciples of Christ) refers to a fictional racist skinhead gang in the movie, "American History X." Now, some racist skinheads actually tattoo themselves with the acronym DOC, paying homage to the gang in the movie.
The term "Disciples of Christ" also has many non-extremist uses. For example, the Disciples of Christ (D.O.C.), also known as the Christian Church, is the name of a non-racist mainstream Protestant religious sect founded in the early 19th century in the United States. In addition, Disciples of Christ (D.O.C.) is the name of a non-racist Christian-oriented hip-hop R&B band.