jan 1, 1986 - 1986 - The Immigration Reform and Control Act of 1986 made hiring illegal immigrants illegal for the first time. It required employers to take the burden of guaranteeing that their employees were legal immigrants, and required them to attest to their employees immigration status. It did, however, make provisions for undocumental agricultural workers and those who immigrated illegally before 1982. This act would begin an era of increasingly tight controls on illegal immigration especially on the southern bor