Upon graduation, Felt took a position at the Federal Trade Commission but did not enjoy the work. His workload was very light. He was assigned a case to investigate whether a toilet paper brand called "Red Cross" was misleading consumers into thinking it was endorsed by the American Red Cross. Felt wrote in his memoir:

My research, which required days of travel and hundreds of interviews, produced two definite conclusions:
1. Most people did use toilet tissue.
2. Most people did not appreciate being asked about it.
That was when I started looking for other employment.[6]
He applied for a job with the FBI in November 1941 and was accepted. His first day at the Bureau was January 26, 1942.

W. Mark Felt