For decades the USA Census Bureau sold a PR line about not being the information source for the WW II round of Japanese-Americans.

That lie quickly folded the first time a historian asked to see Census Bureau documents. In fact the Census Bureau was the primary data source for the Round Up, and responded to Round List Requests and to Individual Queries with a turnaround that was exceptionally fast for a Government Bureaucracy at the time, compared to response times for other types of information requests.

https://www.scientificamerican.com/article/confirmed-the-us-census-b/