Very few may remember this, but a half century ago all 'resident aliens' aka green-card holders were required to annually fill out an Alien Registration Form. I'm a child of immigrants and recall having to do this for my mother every year in January when the federal government would send out a card, basically an IBM computer card format, with fields for address of home and employer. The card would have to be mailed back to Dept of HEW for processing. This ended with the Carter amnesty in the mid 70s. Then illegal immigration began a precipitous rise.