The US Census Bureau is looking to get data about each person's citizenship status from other government agencies.

If the Department of Heartlessness and Suffering already has a person's address, that the Census Bureau gets a copy would not make the person more vulnerable. On the other hand, if perse has moved, perse would be scared to give that new address to the census, thus scared to respond.

Regardless of details, the bully will spread fear of the census among immigrants both authorized and not, to achieve their goal of undercounting immigrants and biasing the census.