首批被抓的非法移民都有犯罪记录。
可以说是罪犯。

In the United States, illegal immigration is generally considered a civil matter, but it can also be criminal.
Civil
Overstaying a visa is usually a civil matter, but it can result in deportation.
也就是说在美国有些非法移民是刑事犯罪,但通常只是民事的,比如你用签证进入美国,但逾期滞留,这就只是民事问题