People who we think work for our government might also work for other governments.
A FBI electronics technician pleaded guilty on Monday to having illegally acted as an agent of China, admitting that he on several occasions passed sensitive information to a Chinese official.
https://www.yahoo.com/news/fbi-employee-accused-being-chinese-agent-plead-guilty-160213392.html
The criminal complaint is available: https://www.justice.gov/opa/file/881161/download