What's been confusing me here is that I have not come across the "Polindep" abbreviation before. This obviously stands for "Political Intelligence Department" which itself causes more confusion.
PWB/AFHQ was created out of both British and American civilian propaganda organisations. U.S. staff came from the Office of War Information and Office of Strategic Services. British staff came from the Political Warfare Executive and Ministry of Information.
The Political Warfare Executive (PWE) often used the cover name of "Political Intelligence Department". There really was a Foreign Office department known as the Political Intelligence Department which also supplied staff to PWE. However, this was always abbreviated as PID and was a purely civilian organisation.
PWB/AFHQ was a military organisation and did contain a political intelligence section. And I suspect that in this case "polindep" is referring to this subsection of PWB/AFHQ.
(A few files are available at the National Archives which contain political intelligence reports created by PWB/AFHQ but nothing that I can find about the organisation of this subsection.)
This is what the final report on PWB/AFHQ has to say about its political intelligence section:"In brief, headquarters of PWB included an Administrative Section, a Planning Board, a Political Intelligence Section and an Operations Section. Each included Americans and British, military and civilian; and because of the shortage of personnel there were many who doubled in function.
"...The Intelligence and Operations heads were civilians from OSS and OWI, respectively.
"The need for a well-organized Intelligence Section became at once apparent. It was the source of much of the material upon which the propaganda output through the Operations Section was based. Its function was of critical importance during the tense Darlan-Giraud phase.
"Monitoring was also an important factor in the intelligence function. With improvised commercial receivers provided from British sources, and with inexperienced personnel, the monitoring section turned out daily digests of enemy broadcasts, providing the service for AFHQ as well as for background for propaganda and counter-propaganda output. It was not until the Federal Communications Commission provided an expert to organize this function, in January, 1943, that it was properly manned and equipped. The Army was unable to provide personnel for this work in its initial phases.
"The Operations Section was responsible for the implementation and control of the various propaganda media, which included Radio, Press, Leaflets, Cinema and Displays."
There was also an independent "Political Intelligence Centre" in the Middle East (Its war diaries are available at the National Archives as well as some of its archives). I don't know how this fits into the equation or whether it had any connection with PWB/AFHQ or PWE or the real PID.
Told you it was confusing!