It would depend on the particular laws of the jurisdictio(s) the conversation took place in, regarding the recording of another person.
For example, in Florida it is illegal to record another person without their knowledge and consent. Any recorded conversation will usually commence with the statement and question, "I am recording this conversation. Do you give your consent to be recorded?" If one fails to do this and knowledge of this recording becomes public, fines, jail time, and restitution are almost certainly following. Of course, this does not include law enforcement recording someone in the act. Nor does it include recording someone who is in public with no reasonable expectation of privacy.
A FSU football player found that out the hard way a few years ago after he made a tape of him and his girlfriend without her knowledge and showed it to his friends.
I'm not sure of the law in Wisconsin or New York.