Importing Users/Users in Another Table

Is it possible to import a list of (web) users? I have a site that has over 1500 users. They don’t need any type of edit capability, only viewing based on the group they belong to.

Ideally I’d like to link to this MySQL table, but importing is fine as well.

You could easily devise an import script via a snippet. If you need help, please provide the SQL structure of your current site’s table. Or, if you want to use the existing code that you use to check if a user is logged in, just put it (slightly modded to work with modx api calls) in a snippet and call it on the first line of your template.