The Congressional Research Service provides non-partisan information on a variety of important topics for members of the United States Congress in the form of CRS Reports.
Here is a sampling of the kind of reports they offered during the last week of June, 2020.
Think Tanks create policy proposals rooted in research.
However, think tanks (aka policy institutes, or research institutes) typically support particular worldviews and are not bound by the constraints of the scholarly method. They exist to advocate and persuade for certain positions. Think tanks may portray themselves as nonpartisan, or bipartisan, but are rarely see as such by all stakeholders.
Here is a sampling of some of the best known, and most influential think tanks. There are thousands of policy research institutes around the globe.
2019 TOP THINK TANKS WORLDWIDE (U.S. and non-U.S.)
The University of Pennsylvania's "2019 Global Go To Think Tank Index Report" by James G. McGann
Here are some sources addressing campus free speech issues.