Each state has laws regarding divorce. Some states require grounds, and some of those may have adultery as one of the grounds. In these cases, an alienation case might be filed as a civil action against the third party. State divorce laws are available online at a number of websites.
Well it depends on what states you are asking about. Alienation laws depend on what the person has done for example. You can basically get a court order on someone so that they stay away from you and in that sense they are alienated in a way. Does that answer your question?
Generally, in order for a parent to seek termination of parental rights for alienation, a parent must have absolutely no contact with the children for a year or more.
These states have alientation of affection laws that allow suit to be brought against the party who allegedly caused it: Mississippi, New Mexico, Illinois, NC, South Dakota, Hawaii and Utah.