"Census workers" refers to people who are hired to gather information and collect data from individuals and households to create an official count or survey of the population in a particular area. Full definition
The new data come from the National Health Interview Survey — a yearly interview in which trained census workers ask tens of thousands of parents about the health of their children. (scientificamerican.com)
This year, fingerprints of prospective census workers are submitted to the FBI and checked against the FBI's fingerprint database. (esrcheck.com)
Specifically he said that census workers in the Philadelphia region had falsified interviews that go into the survey that forms the basis of the monthly unemployment figures. (fivethirtyeight.com)