There are few U.S. government documents from the World War II era about resistance to the Nazis. A few documents which may be useful are:
When you know the title of the item you are seeking, the first step is to search by title in an online catalog.
Cumulative Subject Index to the Monthly Catalog of United States Government Publicationis 1900-1971
MAIN GOV DOCS INDEXES Z 1223 .A 1973x v.1-15
Cumulative Title Index to United States Public Documents 1789-1976
MAIN GOV DOCS INDEXES Z 1223 .Z7L47J83 v.1-16
Monthly Catalog of United States Government Publications, 1895 - 1976
MAIN GOV DOCS INDEXES GP 3.8:
PAIS (Public Affairs Information Service), 1915 - 1972
REF Z 7164 .E2P34
The U.S. State Department has an online collection of full text, declassified documents about the disappearance of Raoul Wallenberg. To search this collection, click on the U.S. State Department search page for their declassified documents collection. Put a check mark in the box next to "Wallenberg," type your search term in the search box and click on the Search button.