Undocumented workers face a huge risk when their employers retaliate against them by reporting them to ICE. Even though the employer is acting illegally if it does so, in general ICE can follow up on the employer’s report. If ICE does follow up, it can try to deport you. Worse, if you used false information or papers when you applied for your job, you may be charged criminally, fined, deported, and prevented from ever returning to live and work in the U.S.
If you are undocumented, the choice of whether to go ahead with a complaint against your employer is one you must make only after very careful thought, and after obtaining competent legal advice from an attorney knowledgeable about both employment law and immigration law.