AWS – Use IAM to control access to a resource based on the account, OU or organization that contains the resource

Today, AWS Identity and Access Management (IAM) introduced a new way that you can control access to your resources based on the account, Organizational Unit (OU) or organization in AWS Organizations that contains your resources. AWS recommends that you set up multiple accounts as your workloads grow. Using a multi-account environment has several benefits including flexible security controls by isolating workloads or applications that have specific security requirements. With this new IAM capability, you now can author IAM policies to enable your principals to access only resources inside specific AWS accounts, OUs, or organizations.

Read More for the details.