AWS Organizations Policy: https://docs.aws.amazon.com/organizations/latest/APIReference/API_Policy.html
AWS Organizational Units: https://docs.aws.amazon.com/organizations/latest/APIReference/API_OrganizationalUnit.html
AWS Organizational Root:
https://docs.aws.amazon.com/organizations/latest/APIReference/API_ListRoots.html
AWS Organization Associations: Policies to account, roots, OUs.