Implementing vigorous retraining policies, for example, would be a better way to counter these adverse effects than calling for mass deportations. This is one reason why labor unions, which once opposed immigration across the board, are now far more supportive of measures that would legalize undocumented workers and create more pathways for migration.
比如，实施严格的限制政策是比大规模遣返更好的抵消这些消极影响的办法。这也是曾经毫无例外地反对移民的工会如今也开始更多地支持能让未登记工人获得合法身份、创造更多移民途径的措施了的原因。