Possible Clues:

• Flash ___ (large group stunt)
• Hard-to-reason-with group
• Angry bunch
• A large, noisy crowd
• Hitman's organization, perhaps
• Unruly lot turn explosive, almost
• They'll make a scene
• Word with "angry" or "flash"
• Subject of the 2011 Jon Roberts memoir 'American Desperado,' with 'the'
• "The Sopranos" group