Accountable.US Action is the advocacy and political arm of Accountable.US, an environmentalist advocacy group that focuses on climate change, alleged “right-wing corruption,” and economic mobility in the United States. Accountable.US Action is a project of the Sixteen Thirty Fund, a left-of-center pass-through and fiscal sponsorship nonprofit managed by the consulting firm Arabella Advisors. Accountable.US is a former project of the New Venture Fund (NVF), the 501(c)(3) affiliate of the Sixteen Thirty Fund. 
Accountable.US Action is the political arm of Accountable.US, and a project of the Arabella Advisors-run Sixteen Thirty Fund.  In 2020, Accountable.US announced that it was “in the process of transitioning from the New Venture Fund,” the sister organization of the Sixteen Thirty Fund, into a standalone nonprofit. 
Accountable.US claims that several other New Venture Fund projects are in fact projects of Accountable.US. These include Restore Public Trust, Allied Progress, and the Western Values Project.  As of 2020, the group had obtained independent tax status.
The group claims to be reinforcing the Accountable.US goal to hold policymakers and special interest groups accountable and to expose government malfeasance. Accountable.US Action purports to conduct educational and electoral activity initiatives and advocates for left-of-center policy in Congress and state legislatures. 
Kyle Herrig is the president of Accountable.US. He leads the Congressional Integrity Project, a separate watchdog group. He previously co-founded American Oversight, a litigation and activism organization that targets Republican officials. 
Tony Carrk is the vice president of issue campaigns for Accountable.US. He previously worked for former Secretary of State Hillary Clinton’s 2016 presidential campaign and worked for the left-of-center nonprofit groups Protect Our Care and the Center for American Progress Action Fund. 
Derek Martin is the director of research and campaigns at Accountable.US. He was previously the research director for Allied Progress. He also previously worked in counterintelligence at the U.S. Department of Defense (DOD).