Turkish Republic of Northern Cyprus Representative Office to the United States

The Center for Strategic and Budgetary Assessments (CSBA) is an independent, non-profit, Washington, D.C.-based think tank specializing in US defense policy, force planning, and budgets. It is headed by Thomas Mahnken. According to its website, CSBA's mission is "to promote innovative thinking and debate about national security strategy, defense planning and military investment options ... [and] to enable policymakers to make informed decisions in matters of strategy, security policy and resource allocation."CSBA emphasizes initiatives the United States and its allies can take to wisely invest in the future, including during periods of fiscal austerity and uncertainty. CSBA evaluates its policy proposals through the net assessment methodology, wargaming, and by estimated impact on the Department of Defense budget over multiple Future Years Defense Programs.

1620 L Street is a high-rise building in Washington, D.C. The building rises 12 floors and 157 feet (48 m) in height. The building was designed by architectural firm Smith, Segreti, Tepper, McMahon & Harned and was completed in 1989. As of July 2008, the structure stands as the 24th-tallest building in the city, tied in rank with 1111 19th Street, 1333 H Street, 1000 Connecticut Avenue, the Republic Building, 1010 Mass, the Army and Navy Club Building and the Watergate Hotel and Office Building. 1620 L Street is an example of postmodern architecture, and has a glass and granite facade. It is composed almost entirely of office space, with 512,000 square feet (48,000 m2) of commercial area; the three basement levels are used as parking space, containing a 126-spot parking garage. The street level floor is used for commercial retailing.

The Hill is an American newspaper and digital media company based in Washington, D.C. that was founded in 1994. In 2020, it was the largest independent political news site in the United States. Focusing on politics, policy, business and international relations, The Hill's coverage includes the U.S. Congress, the presidency and executive branch, and election campaigns. The Hill describes its output as "nonpartisan reporting on the inner workings of Government and the nexus of politics and business".The company's primary outlet is TheHill.com. The Hill is additionally distributed in print for free around Washington, D.C. and distributed to all congressional offices. It is owned by Nexstar Media Group.

The Club for Growth is a 501(c)(4) conservative organization active in the United States, with an agenda focused on cutting taxes and other economic policy issues. Club for Growth's largest funders are the billionaires Jeff Yass and Richard Uihlein. The club has two political arms: an affiliated traditional political action committee, called the Club for Growth PAC, and Club for Growth Action, an independent-expenditure only committee or Super-PAC.According to its website, the Club for Growth's policy goals include cutting income tax rates, repealing the estate tax, supporting limited government and a balanced budget amendment, entitlement reform (including Social Security reform, Medicare and Medicaid reform), free trade, tort reform, school choice, and deregulation. The group has opposed government action to curb greenhouse gas emissions. The Club for Growth PAC endorses and raises money for candidates who meet its standards for fiscal conservatism. According to Politico, "The Club for Growth is the pre-eminent institution promoting Republican adherence to a free-market, free-trade, anti-regulation agenda." The Guardian described the group as "one of the biggest backers" of Republicans who later voted to overturn the results of the 2020 United States presidential election, having spent around $20 million on their campaigns in 2018 and 2020.

The Little Green House on K Street was a residence in Washington DC, USA, where the notoriously corrupt deals of Warren Harding's presidency (1921–1923) are believed to have been planned.

Independent Sector is a coalition of nonprofits, foundations and corporate giving programs. Founded in 1980, it is the first organization to combine the grant seekers and grantees. Located in Washington, D.C., Independent Sector largely works on federal policy issues that affect the nonprofit and philanthropic sector, including tax incentives and exemption status of organizations within the sector. Several other organizational goals include cultivating leaders and emerging leaders, supporting and enhancing organizational effectiveness and ethical practices, and being the vital voice of the sector.

The American Federation of State, County and Municipal Employees (AFSCME) is the largest trade union of public employees in the United States. It represents 1.3 million public sector employees and retirees, including health care workers, corrections officers, sanitation workers, police officers, firefighters, and childcare providers. Founded in Madison, Wisconsin, in 1932, AFSCME is part of the AFL–CIO, one of the two main labor federations in the United States. AFSCME has had four presidents since its founding. The union is known for its involvement in political campaigns, almost exclusively with the Democratic Party. AFSCME was one of the first groups to take advantage of the 2010 Citizens United decision, which allowed unions and corporations to directly finance ads that expressly call for the election or defeat of a candidate. Major political issues for AFSCME include single-payer health care, protecting pension benefits, raising the minimum wage, preventing the privatization of government jobs, and extending unemployment benefits.According to their website, AFSCME is divided into approximately 3,400 local unions in 46 U.S. states, plus the District of Columbia and Puerto Rico.

Students For Liberty (SFL) is an international libertarian non-profit organization with origins in the United States. Its stated mission is "to educate, develop, and empower the next generation of leaders of liberty." Formed in 2008 after a meeting at which students shared ideas and experiences about classical liberal student groups, SFL has since grown into a full organization with various programs and a network of affiliated student groups.The organization hosts an annual international conference as well as various regional conferences. As of 2014, the SFL network self-reported that it had a membership of 1,000 student organizations around the world. SFL's expansion is encouraged and supported by current students involved in its Campus Coordinators program.On August 1, 2016, Dr. Wolf von Laer became the chief executive officer.

The Puerto Rico Federal Affairs Administration (PRFAA)—Spanish: Administración de Asuntos Federales de Puerto Rico—is the executive agency of the government of Puerto Rico that represents the government of the island and its dependencies and municipalities before entities of or in the United States, including: The Federal Government of the United States Local and State Governments of the United States Public or Private Entities in the United StatesThe administration is similar to a State-Federal relations office and serves as the primary liaison between Puerto Rico's officials, the White House, Congress, and the federal agencies of the United States. Additionally, the office interacts with national organizations representing U.S. governors of other states such as the National Governors Association and the Southern Governors' Association. PRFAA also coordinates the lobbying efforts of the Puerto Rico executive branch in Washington, DC, and assists other Puerto Rican agencies and municipalities in grant-seeking efforts. The agency is also supposed to support the work of the Resident Commissioner of Puerto Rico but the relationship tends to be tumultuous when the governor and the resident commissioner come from different political parties. PRFAA's headquarters are located in Washington, D.C., at 1100 17th Street NW, while its Regional Office is located at 6925 Lake Ellenor Drive, Orlando, FL 32809.

The Center for the National Interest is a Washington, D.C.-based public policy think tank. It was established by former U.S. President Richard Nixon on January 20, 1994, as the Nixon Center for Peace and Freedom.The group changed its name to The Nixon Center in 1998. In 2001 the center acquired The National Interest, a bimonthly journal, in which it tends to promote the realist perspective on foreign policy. The center's president is Dimitri K. Simes. In March 2011, the center was renamed the Center for the National Interest (CFTNI or CNI). The change was due to a conflict between leadership of the Center and the Richard Nixon Family Foundation and was part of "a long-running battle over former President Richard Nixon’s complicated legacy," with Foundation members criticizing the center's president for "attacking their party’s presidential candidate, John McCain, for his denunciations of Russia’s invasion of Georgia," and "discomfort at the Center over the Foundation’s obsession with re-litigating Watergate and its legacy." Despite its separation from the Nixon Foundation, the center's leadership expressed its desire to "continue its forward-looking application of Nixon's foreign policy principles to today's international environment."According to the 2014 Global Go To Think Tank Index Report (Think Tanks and Civil Societies Program, University of Pennsylvania), the center is number 43 (of 60) in the "Top Think Tanks in the United States". According to the 2019 Global Go To Think Tank Index Report, the center is number 46 (of 107) in the "Top Think Tanks in the United States". In 2006 it had an annual budget of $1.6 million.In 2016, the think tank hosted Donald Trump's first major foreign policy address, leading to one of its fellows being fired for criticizing the organization's decision in an op-ed article. The Trump campaign's interactions with Simes and the Center became part of the 2017-2019 Special Counsel investigation. The Mueller report ultimately found no evidence of wrongdoing by Simes or the center, but the investigation reportedly hurt the think tank financially.

Third Way is a Washington, D.C.–based public policy think tank founded in 2005. Third Way develops and advocates for policies that it claims represent "modern center-left ideas".Third Way was honoured as the 2013 North American Think Tank of the Year by Prospect, a British monthly current affairs magazine, for its "original, influential, and rigorous work on the most pressing challenges facing people, governments, and businesses". The think tank's supporters and advocates include Democratic politicians, other center-left think tanks, and individual donors. Third Way's funding also partially comes from philanthropy, foundations and personal donations. In the past decade, Third Way has been directly involved in policy issues such as the benefits of energy innovation, student accountability measures under the Every Student Succeeds Act, deficit reduction, proposals to reform Medicare and Medicaid, the repeal of "Don't ask, don't tell," and new trade accords with Korea, Colombia, and Panama.

The Thomas B. Fordham Institute is an ideologically conservative American nonprofit education policy think tank, with offices in Washington, D.C., Columbus, Ohio, and Dayton, Ohio. The institute supports and publishes research on education policy in the United States.