Discussions of previous acts are generally subject to the attorney-client privilege. If, for example, if a client tells his lawyer that he robbed a bank or lied about assets during a divorce, the lawyer probably can’t disclose the information.
From this link:
https://www.nolo.com/legal-encyclopedia/attorney-client-privilege.html
The difference here is that the lawyer was a co-conspirator, and the conspiracy to commit the crime(s) was the subject of the conversations.
on the other hand discussions of future or pending crimes MAY be subject to the criminal-fraud exception to attorney client privilege
http://repository.law.miami.edu/cgi/viewcontent.cgi?article=1850&context=umlr