Federal employees were among the hundreds of victims of what prosecutors Thursday described as a large-scale identify theft ring operating in the Washington area. Ten people were charged in the scam to steal personal information, including social security numbers, from dental and insurance offices and other area businesses, the US Attorney for the Eastern District of Virginia announced in a news release Thursday. A copy of the indictment can be viewed here. Prosecutors said more than 600 potential victims have been identified, including employees at the State and Defense departments and the U.S. Agency for International Development. Once they stole…