http://www.onwar.com/chrono/1941/dec41/f23dec41.htm
Axis abandon Benghazi
Tuesday, December 23, 1941 www.onwar.com
In North Africa... Rommel’s troops evacuate Benghazi. Allied troops enter Barce.
On Wake Island... The American troops surrender to the Japanese, the carriers sent to relieve them are still several hundred miles away.
In Burma... The first Japanese air attacks on Rangoon. The city’s air defense consist of only two fighter squadrons, one from the RAF, the other an American Volunteer Group
In Borneo... Japanese land troops at Kuching, the capital of Sarawak. Dutch submarines provide some resistance sinking two troops transports and a Japanese destroyer. A small British force continues to resist at Kunching.
"The military report on Fifth Column activity in the Hawaiian Islands buttressed a report already made by Frank Knox, Secretary of the Navy, that such activities prior to the Japanese onslaught on Dec. 7 were second only to the Fifth Column activities that enabled the Germans to overpower Norway..."
So far as any recent historical account will tell, all such reports of "Fifth Column activity" are pure figments in the imaginations of Knox, Roosevelt, Hoover & others.
If there ever were any actual incidents, they seem to have been scrubbed from the historical record.