Making Dhikr by the Sufis in one voice while swaying is an act of Bid`ah. It is authentically reported that the Prophet (peace be upon him) said:
Who innovates something which is not in harmony with the principles of our religion, that thing is rejected.
The Prophet (peace be upon him) also said:
He who does any act for which there is no sanction from our behalf, that is to be rejected.
Related by Imam
Muslim in his Sahih (authentic) book of Hadith.
It is sufficient for a Muslim to follow the Prophet (peace be upon him) in terms of his words and deeds.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.