The AWS CloudTrail Attempt To Leave Org rule detects unauthorized attempts to remove an AWS account from an organization using AWS CloudTrail logs. Such actions can lead to potential security breaches since many controls are often established at the organizational level. Therefore, this rule is essential for monitoring specific API calls related to leaving an AWS Organization, particularly the 'LeaveOrganization' action. By analyzing the related information such as user identity, source IP address, and associated permissions, security teams can quickly determine if an account's action is malicious and investigate further to maintain organizational integrity.