Vivian writes, "My husband is a so-called undocumented alien and it seems that some people who hate him have threatened to report him to the authorities. Can the cops come to my house, take him away and deport him to Mexico?"
Legally speaking, the job of the ICE is to actually deport anyone who is not authorized to be in the USA. However, because there are more than 12 million illegal immigrants in the country, it is not possible to catch them, so they leave them alone. Unless you husband breaks any other law, chances are that they will leave him alone, even if someone calls to report him. In any case, since you are presumably legal, you should hire an immigration attorney to fix his papers because there is no point in living under fear.