Alger Hiss worked in high-level roles in the U.S. government during the Franklin D. Roosevelt administration. And then he was accused of using his access to spy for the Soviets.
Research:

SYMHC Classics: COINTELPRO 1
39:12

Behind the Scenes Minis: It's Not Unprecedented
16:46

The Rendition of Anthony Burns, Part 2
43:32