Sufis are sunni. Sufism or Tasawuf is a process of leaving the dunya for Allah alone.
Anyone who does the above is basically treading a Sufi path.
Traditionally, some Shayook mastered the process and taught it to students known a murideen.
Amongst the sufis have been great warriors, pious shayook and deviants, just as you will find in any type of group.
