Amazon SageMaker Ground Truth now enables better control and access with condition keys specific to Amazon SageMaker Ground Truth. You can use these condition keys in the Condition element of an Identity and Access Management (IAM) policy to further refine the conditions under which the policy statement applies. 

from Recent Announcements: https://aws.amazon.com/about-aws/whats-new/2019/11/amazon-sagebaker-ground-truth-now-supports-more-refined-access-control/