(help needed) How to list out the users from an OU

I’ve gone in circles on this an confused myself, so I need sanity. I’ve got users in various departments: “OU=Departments,DC=mydomain,DC=local”

Under that, the groups are like Treasurer, Engineer, Building and Grounds, etc., and the groups contain AD users.

Here’s the command I arrived at to list off my groups in the Departments OU:

get-adobject -filter 'ObjectClass -eq "organizationalUnit"' -SearchBase "DC=mydomain,DC=Local" | where { $_.distinguishedname -like "*Departments*"} | select name,distinguishedname | sort name 

This works fine, shows me all my departments like I want to see them. From there, though, I’ll be damned if I can go the next step and pull the users out of the departments. Did I start off on the wrong foot, and that’s why I’m failing? I won’t even try to list off all the crap I’ve tried–I’m very confused and lost track, just stabbing in the dark eventually. Your help is much appreciated.

(Edit for privacy)