A group of rioters (दंगा करने वाले) → mob
A group of robbers (चोर/ लुटेरे) → band/ gang
A group of dancers (नर्तक) → group/ troupe
A group of directors (निर्देशक) → board
A group of sailors (नौकाचालक) → crew
A group of employees (कर्मचारी) → staff