Unfortunately in the US, any conviction leads to essentially a work "blacklist," whereby employers do background checks and deny employment for anything they find within 7 years.
Which fraternity?
No, it is not, because background check and other third-party intelligence firms aren't purely reactive now, they have and use tools to proactively vacuum up public records and maintain their own DBs. After-the-fact sealing of arrest records or expunging of convictions has no effect on data that is already in third-party hands.