filter by user

I'm in need of a module that would allow an admin to filter all content (nodes and comments) by user. For example, we have a site with 122k+ users creating nodes and comments and sometimes we get complaints of spam from some. It would be a big help if we could see all nodes and comments authored by the user in question to help determine if it's a one-time issue or if they are a repeat offender.

Is there a module out there that does this or do I need to write one?

Thanks.
-Brian