First preference would be given to those persons whose services are especially advantageous to the United States. This wording is substantially more liberal than the present law which restricts first preference to those who are needed urgently. Fifth. A fourth preference is established for brothers. sisters. married sons. and daughters of U.S. citizens. thus doubling the number of visas available to them under former provisions. and parents of resident aliens are added to the preference list. Unused numbers are made available to persons willing to work at Jobs for which a shortage of willing workers exists in the United States. Sixth.