I'll post the obvious resources:
80k's US AI Policy article
Future of Life Institute's summaries of AI policy resources
AI Governance: A Research Agenda (Allan Dafoe, FHI)
Allen Dafoe's research compilation: Probably just the AI section is relevant, some overlap with FLI's list.
The Malicious Use of Artificial Intelligence: Forecasting, Prevention, and Mitigation (2018). Brundage and Avin et al.: One of the earlier "large collaboration" papers I can recall, probably only the AI Politics and AI Ideal Governance sections are relevant for you.
Policy Desiderata for Superintelligent AI: A Vector Field Approach: Far from object-level, in Bostrom's style, but tries to be thorough in what AI policy should try to accomplish at a high level.
CSET's Reports: Very new AI policy org, but pretty exciting as it's led by the former head of IARPA so their recommendations probably have a higher chance of being implemented than the academic think tank reference class. Their work so far focuses on documenting China's developments and US policy recommendations, e.g. making US immigration more favorable for AI talent.
Published documents can trail the thinking of leaders at orgs by quite a lot. You might be better off emailing someone at the relevant orgs (CSET, GovAI, etc.) with your goals, what you plan to read, and seeing what they would recommend so you can catch up more quickly.