Which is part of payroll fraud? A. Fake invoices
B. Ghost employee
C. Fake bold
D. Altered inventories

Payroll fraud is when employees or employers wrongfully manipulate the payroll system to either receive payment they haven't earned or, in the case of employers, withhold payment of rightfully earned wages or taxes due on those wages. - Anglish

answer; i believe the two groups were irish immigrants and chinese immigrants;