WASHINGTON — The F.B.I. is subjecting hundreds of its employees who were born overseas or have relatives or friends there to an aggressive internal surveillance program that started after Sept. 11, 2001, to prevent foreign spies from coercing newly hired linguists but that has been greatly expanded since then.

The program has drawn criticism from F.B.I. linguists, agents and other personnel with foreign language and cultural skills, and with ties abroad. They complain they are being discriminated against by a secretive “risk-management” plan that the agency uses to guard against espionage. This limits their assignments and stalls their careers, according to several employees and their lawyers.

Employees in the program — called the Post-Adjudication Risk Management plan, or PARM — face more frequent security interviews, polygraph tests, scrutiny of personal travel, and reviews of, in particular, electronic communications and files downloaded from databases.

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