My brother is working with 'x' client through 'y' employer on 6 month Contract to Hire basis! 'y' employer helped him to make resume( we all know how his resume was made)!

My brother knew that 'x' client did all employment verifications for all persons who joined their directly as full time employee!

What will happen to my brother if they opted for all employment verification? Can 'y' employer can help him?