The Progressive Congress Foundation (Progressive Congress) was a left-wing organization that sought to push the Democratic Party further to the political left.  In 2018, Progressive Congress became the Congressional Progressive Caucus Center (CPCC). CPCC is a think tank affiliated with the Congressional Progressive Caucus, a left-wing congressional caucus that works to shift the Democratic Party’s platform further to the left. 
Before it morphed into CPCC, the Progressive Congress board featured several high-profile, left-of-center activists and officials. These included former chair of the Congressional Progressive Caucus Keith Ellison (D-MN), founder and director of the Campaign for America’s Future Robert Borosage, and former president of the Economic Policy Institute Lawrence Mishel. 
Progressive Congress has removed its website and all information about the organization from the internet, though archives of the Progressive Congress website remain available. 
It is unclear who founded Progressive Congress. The organization first appeared online in April 2009 as the American Progressive Caucus Policy Foundation (APCPF). The APCPF described itself as a “communications, fact finding, research and education center for progressive leaders.”  In 2010, the organization rebranded as ProgressiveCongress.org, shifting its focus to health care. Progressive Congress joined with organizations including the and the AFL-CIO to support left-progressive health care policy implementation.  
Archives of the Progressive Congress website reveal that it remained in operation until 2017, when the Progressive Congress rebranded and became the Congressional Progressive Caucus Center (CPCC).  Prior to 2018, Progressive Congress operated as a think tank and communications firm on behalf of left-progressive policies and politicians, expanding its focus beyond healthcare to advocate for left-of-center policy implementation on issues including economic regulation, abortion, national security, labor organizing, and immigration. Progressive Congress funneled donations to the organization through the Action Network, a left-of-center online fundraising platform. 
Before becoming Congressional Progressive Caucus Center, Progressive Congress portrayed itself as the “driving force for progressive change.” The organization hosted fellowships and summits on behalf of left-progressive officials and organizers, designed communication strategies for left-wing policy positions, and developed policy recommendations. 
Much of Progressive Congress’s work focused on communicating left-progressive ideals. Progressive Congress hosted an annual summit that brought together left-progressive lawmakers and grassroots organizers, claiming that the summit “set the agenda for the progressive movement” each year. Progressive Congress also placed fellows with left-wing officials on Capitol Hill. Most notably, Progressive Congress launched the Congressional Messenger Program, an initiative that trained activists and media professionals to cast left-wing policies in an appealing light and create a “media-ready team of compelling spokespersons in Congress,” specifically to advance far-left immigration policy. 
In 2016, Progressive Congress launched the Women’s Initiative, a project that sought to implement left-wing abortion policy. The Initiative claimed that expanding access to abortion would make women more well-off and claimed that a lack of access to abortions caused “poverty” among women.  The Initiative also supported proposals to use federal funding for abortions. 
In 2011, Darcy Burner spoke to Politico, representing herself as president of Progressive Congress. Burner is a failed political candidate who ran for the U.S. House of Representatives as a Democrat in 2012 and as a Democrat for the Washington House of Representatives in 2016.  Burner has also sat on the boards of a number of left-of-center organizations, including NARAL Pro-Choice America and the Congressional Progressive Caucus PAC. 
As of 2018, Gabriela Lemus worked as president of Progressive Congress. Before working at Progressive Congress, Lemus led the Labor Council for Latin American Advancement, a constituency group of the AFL-CIO. Lemus also worked in the Washington Office on Latin America (WOLA), a left-of-center advocacy organization.
While all information related to Progressive Congress has been taken offline, archived versions of its website list several high-profile, left-of-center advocacy figures as Progressive Congress board members. These included Robert Borosage, founder and director of the Campaign for America’s Future; former chair of the Congressional Progressive Caucus Keith Ellison (D-MN); John Cavanagh, executive director of the left-wing Institute for Policy Studies; and Larry Mishel, former president of the Economic Policy Institute. 
Several other Progressive Congress board members have extensive experience in left-of-center organizing. Amalgamated Bank president Keith Mestrich, former publisher of The Nation Katrina vanden Huevel, UltraViolet co-founder Shaunna Thomas, and Bend the Arc Jewish Action director Hadar Susskind all sat on the Progressive Congress board of directors. 
While CPCC does not disclose its board members on its website, the organization’s tax filings indicate that each of the listed Progressive Congress board members remained board members at CPCC following the rebranding, at least as of 2018.