They had been convicted in 2008 of rape, murder and unlawful assembly.
他们于2008年被判强奸、谋杀和非法集会罪。
英语百科
Unlawful assembly
Unlawful assembly is a legal term to describe a group of people with the mutual intent of deliberate disturbance of the peace. If the group are about to start the act of disturbance, it is termed a rout; if the disturbance is commenced, it is then termed a riot. In Britain, the offence was abolished in 1986.