Americans for Prosperity (AFP) is a major libertarian conservative political advocacy organization in the United States, founded in 2004 by David Koch (and Charles Koch, per Source B) as the primary political arm of the Koch brothers' network. AFP promotes principles of limited government, free markets, economic freedom, and individual liberty through grassroots mobilization, lobbying, educational campaigns, ballot initiatives, and policy advocacy at local, state, and federal levels. The organization operates as a 501(c)(4) nonprofit, allowing it to engage in political activities with limited disclosure requirements, and has grown into one of the most influential conservative groups, spending tens to hundreds of millions on elections and policy fights through entities like its super PAC arm, Americans for Prosperity Action. AFP has been instrumental in conservative movements, including training Tea Party activists, opposing regulations on issues like climate change and energy, advocating for tax cuts and deregulation, and fighting government expansion programs such as the Affordable Care Act. Critics view AFP as a key player in dark money politics and astroturfing, enabling anonymous spending to influence elections and policy, often linked to fossil fuel interests and Koch Industries, while supporters praise its role in empowering citizens against perceived government overreach. With operations across all 50 states and chapters in multiple states like Idaho, Ohio, and Michigan, AFP leverages digital tools, organizes rallies, runs advertising campaigns, and supports candidates aligned with its ideology. Funded largely by contributions from conservative donors, including Koch family foundations, AFP reported revenues exceeding $186 million in 2023. The organization's influence extends through partnerships with think tanks, other advocacy groups, and media figures, and it has adapted to political shifts, endorsing aspects of Republican agendas and engaging with figures like U.S. Senator Mike Crapo and Governor Brad Little. Despite controversies over funding transparency and perceived corporate influence, AFP remains a powerhouse in American politics, shaping conservative agendas and mobilizing millions of activists.