Answer:
The former State Department employee that was accused of passing top-secret papers to the Soviets was Alger Hiss.
Step-by-step explanation:
Alger Hiss worked in the administrations of Franklin Delano Roosevelt and Harry Truman. He was accused by the House Un-American Activities Committee of having been a communist. He denied under oath, but was convicted of perjury thanks to the convincing testimony of Whittaker Chambers, his old party mate. From many subsequent research it appears that Hiss, in addition to being a communist, was also in all probability a Soviet spy.