approach is all wrong. the solution to the problem is get the name of census worker and then for no reason at all their tires are slashed and windows broken out of their home. avoid direct confrontation whenever possible.
If we can't get a resident to respond... Because we had her dragged out into the street and shot or whatever... We ask the neighbors or anyone else who might know how many people lived at the address on April 1st. No worries there.