"We offer multiple reporting options to workers, including a helpline that

gives workers an option to report concerns anonymously. We promote

these reporting options through our internal policies, communications,

and trainings. We also have a policy prohibiting retaliation for raising

concerns." (Page 5)

Leah's answer seems correct. There is a hotline for employees, including employees of suppliers, and whistleblowing protections for both groups, which has been indicated within Google's MSA statement on p.5.