Algorithmic audits can be a tool for accountability in potentially biased or harmful AI systems. But if they are inconsistent and unregulated, audits could make the problems worse. In “Who Audits the Auditors?”, the Algorithmic Justice League (AJL) shares the first field scan of the algorithmic auditing ecosystem. The scan unearthed best practices, tools and methods, and common barriers to effective auditing. MacArthur grantee AJL recommendations for companies, regulators and lawmakers, and auditors themselves. Increasing oversight, creating clearly defined standards, improving transparency, and engaging stakeholders in the audit process could help make them more effective.