You need something like this?
select substr(hug.USERGROUPNAME,1,60), substr(hu.username,1,10)
from haruser hu,
harusersingroup huig,
harusergroup hug
where hu.usrobjid = huig.usrobjid
and huig.usrgrpobjid = hug.usrgrpobjid
GROUP BY hug.USERGROUPNAME, hu.username
order by hug.USERGROUPNAME;
Not very elaborated, I know.
Peter