Give the other users permission to kill the processes as the low priority user through
sudo -u lowpriouser /bin/kill PID
A user can only signal their own processes, unless they have root privileges. By using
sudo -u a user with the correct set-up in the
sudoers file may assume the identity of the low priority user and kill the process.
%killers ALL = (lowpriouser) /bin/kill
This would allow all users in the group
killers to run
See also the
sudoers manual on your system.
On an OpenBSD system, the same can be done through the native
doas utility with a configuration like
permit :killers as lowpriouser cmd /bin/kill
doas -u lowpriouser /bin/kill PID
See the manuals for