Is selinux supported for use on nodes running TSAMP/RSCT?
No, TSAMP and RSCT are not supported running on RHEL with selinux enabled.
To disable selinux on your systems you should read from Redhat's support library on how to perform that procedure.
Here is a possible solution:
Edit the file /etc/selinux/config
Change the following line:
This requires a reboot to have it take effect. Please consult with your System Administrator before taking these steps.