A national non-profit group that helps victims of child sexual abuse has become a victim itself — of a scam by its own employees.

Federal court documents say three employees of the National Children's Alliance in Washington orchestrated a payroll scheme that cost the nonprofit group more than $50,000.

A staff accountant, Michael Young, pleaded guilty today to taking nearly $10,000 in five extra paychecks. He told the judge he now has a new job at another nonprofit.

Earlier this month, the agency's former finance director — Sharon Martin — pleaded guilty to stealing eight payroll paychecks totaling more than $15,000. She and Young each face up to six months in prison.

And the group's former chief financial officer is scheduled to plead guilty next month. Marvin Perry has been charged with stealing $27,000 in additional paychecks.