Hi, Eliza-
I can read your statement two ways:
1. The the information collected in the census is confidential and will not be made available to the Government or its agencies - if that were the case, that would make me wonder why the Government would collect census information at all (or do they mean specific information about individuals, as opposed to composite information).

2. Or could it be that you believe that this information is already available to the Government, thus making it unnecessary for a census.

I did background investigations for the U.S. Government for 25 years, knocking on doors and asking questions about people who needed security clearances. Oftentimes, people wondered why I went door-to-door, because they figured the Government already had that information. Well, the way they got the information was to go door-to-door. We collected personal information only on people working in law enforcement or other sensitive positions, or having access to military secrets.

-Joe-