This report provides an overview of federally regulated entities that possess legal characteristics of both the governmental and private sectors. These hybrid organizations (e.g., Fannie Mae, National Park Foundation, In-Q-Tel), collectively referred to in this report as the "quasi government," have grown in number, size, and importance in recent decades. A brief review of executive branch organizational history is followed by a description of entities with ties to the executive branch, although they are not "agencies" of the United States as defined in Title 5 of the U.S. Code. Several categories of quasi governmental entities are defined and discussed: (1) quasi official agencies, (2) government-sponsored enterprises (GSE), (3) federally funded research and development corporations, (4) agency-related nonprofit organizations, (5) venture capital funds, (6) congressionally chartered nonprofit organizations, and (7) instrumentalities of indeterminate character. The quasi government, not surprisingly, is a controversial subject. To supporters of this trend toward greater reliance upon hybrid organizations, the proper objective of governmental management is to maximize performance and results, however defined. In their view, the private and governmental sectors alike in their essentials, and thus subject to the same economically derived behavioral norms. They tend to welcome this trend toward greater use of quasi governmental entities. Critics of the quasi government, on the other hand, tend to view hybrid organizations as contributing to a weakened capacity of government to perform its fundamental constitutional duties, and to an erosion in political accountability, a crucial element in democratic governance. They tend to consider the governmental and private sectors as being legally distinct, with relatively little overlap in behavioral norms. Congress is increasingly engaged with the quasi government. The issues run the gamut from enacting legislation to encourage the creation of nonprofit organizations to promote individual national parks, to proposals to strengthen regulation of government-sponsored enterprises such as Fannie Mae, to oversight hearings respecting national security issues at Los Alamos Laboratory. There is nothing modest about the size, scope, and impact of the quasi government.