A deadline has passed in the Dominican Republic for undocumented workers of Haitian descent to register their presence or risk mass deportation. Half a million people could be sent to Haiti under a ruling that stripped the citizenship of children born to Haitian immigrants in the Dominican Republic as far back as 1929, retroactively leaving tens of thousands stateless. On Wednesday, people lined up across the country to register before a midnight deadline. State officials say they will begin patrolling migrant neighborhoods to look for those who have not signed up. The Dominican Republic’s decision to denationalize hundreds of thousands of people has sparked an international outcry.