U.S. Department of Commerce Bureau of Industry and Security (BIS) (the EAR folks) - https://www.bis.doc.gov/index.php
U.S. Department of State Directorate of Defense Trade Controls (DDTC) (the ITAR folks) - http://pmddtc.state.gov/
U.S. Department of the Treasury Office of Foreign Asset Controls (OFAC) (the sanctions folks) - https://www.treasury.gov/about/organizational-structure/offices/Pages/Of...
Nuclear Regulatory Commission Export-Import - https://www.nrc.gov/about-nrc/ip/export-import.html
U.S. Department of Agriculture Animal and Plant Health Inspection Service (APHIS Import Export - https://www.aphis.usda.gov/aphis/ourfocus/importexport
U.S. Department of the Interior U.S. Fish & Wildlife Service – Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) - https://www.fws.gov/international/cites/ & Travel & Trade - https://www.fws.gov/international/travel-and-trade/
U.S. Department of Energy - https://energy.gov/sites/prod/files/2016/06/f32/PF2016-30a.pdf (DOE is an extremely hard sit to find information easily) or look in the Export Administration Act section g and the Export Administration Regulations section h
U.S. Food and Drug Administration - https://www.fda.gov/default.htm (Look under the various tabs for the terms “Guidance and Regulation” or Guidance, Compliance & Regulatory Information” or related wording.
U.S. Department of Defense, Defense Technology Security Administration (DTSA) - http://www.dtsa.mil/SitePages/default.aspx
Laws and Regulations
Arms Export Control Act - https://www.law.cornell.edu/uscode/text/22/chapter-39
Electronic Code of Federal Regulations (e-CFR) the International Traffic in Arm Regulations (ITAR) - http://www.ecfr.gov/cgi-bin/text-idx?gp=&SID=adf8c2f6d1a00b36d974556a10b...
e-CFR Export Administration Regulations (EAR) - http://www.ecfr.gov/cgi-bin/text-idx?SID=57e4542c46300f3c09ef4c084b4541f...
U.S. Department of Treasury Office of Foreign Assets Controls (OFAC) Sanction Information - https://www.treasury.gov/resource-center/sanctions/Pages/default.aspx