ringleader
noun
                                                                                                                            
                                                            ring·lead·er
                    
                                                                                                              
                                                                                                                                  ˈriŋ-ˌlē-dər 
                                                      
                                                          
            
                                
              
          
                                                      : a leader of a ring of individuals engaged especially in improper or unlawful activities                                      
                
                    
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  Merriam-Webster unabridged




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