What law is that? When did Congress pass it? Can you cite it?
The Constitution calls for a census (a head count) to be done every ten years. That's all.
Yes, I can.
http://www.law.cornell.edu/uscode/text/13
The ACS is conducted under the authority of Title 13, United States Code (U.S.C.), Sections 141 and 193, and response is required by law. According to Section 221, persons who do not respond shall be fined not more than $100. Title 18 U.S.C. Section 3571 and Section 3559, in effect amend Title 13 U.S.C. Section 221 by changing the fine for anyone over 18 years old who refuses or willfully neglects to complete the questionnaire or answer questions posed by census takers from a fine of not more than $100 to not more than $5,000.
https://ask.census.gov/faq.php?id=5000&faqId=7455
Typically they won’t fine you or they’d be in court left and right and cause it an uproar. I am not saying he would be fined, I am saying those who spout the ‘I only have to the number of people in my house’ are speaking out the wazoo.