The specifics of those ties were not revealed, but the groups most often cited as attempting to infiltrate the U.S. intelligence network were al Qaeda, Hamas and Hezbollah.
The NSA, in response, launched investigations into 4,000 instances of suspected abnormal staff activity, Ynet News said. Those investigations included the tracking of employee keystrokes on agency computers and the recording of document downloads.
“Over the last several years, a small subset of CIA’s total job applicants were flagged due to various problems or issues,” one unnamed agency official said, as Ynet News reported.
“During this period, one in five of that small subset was found to have significant connections to hostile intelligence services and-or terrorist groups.”
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http://www.washingtontimes.com/news/2013/sep/2/cia-finds-1-5-job-applicants-hail-hamas-hezbollah-/#ixzz2dv7dKIz1