The authorities arrested more than 300 members of the Dervish community on February 20 following clashes when the authorities violently repressed a protest in Tehran. The clashes left dozens injured and three police officers and another security force member dead. On March 18, after an unfair trial that lasted three sessions, the authorities sentenced Mohammad Sallas, 46, to death on charges of killing the police officers by driving a bus into a crowd of security officers.
https://www.hrw.org/news/2018/05/15/iran-looming-execution-dervish-member