Many companies and individuals did treat them as slaves figuring they would not or could not go to the cops or the employment people.   That is one of the reasons that employment laws have to be enforced.   
With  the sanctuary laws that Oregon and other areas are insisting on having, it makes it harder for ICE not to act as stormtroopers.  
As far as how to handle the deportation, I already suggested encouraging them to self deport.  As far as tearing families apart, that is not on ICE, that is on the illegals themselves.  In what other crimes do we worry about tearing the family apart?  Also, another answer can be to offer to deport the whole family.