Roll up

www.foxnews.com/opinion/2017/08/16/time-to-end-north-korea-sanctions-merry-go-round.html

Third, we need to shut down North Korean proliferation networks once and for all. For years, the U.S. government has attempted to monitor North Korean shipping networks to prevent proliferation of WMD materials or dual use items. North Korea has successfully evaded these restrictions in part because of the unwillingness of many countries to shut down transshipment points and roll up networks of facilitators. The United States should be boarding North Korean vessels, forcing Beijing to stop flights, and putting pressure on other transit countries to roll up proliferation facilitators. Ignoring the proliferation threat means that the threat could extend well beyond North Korea’s ICBM program into the Middle East or other regions.

Could you please let me know what "roll up networks of facilitators", "board", and "roll up proliferation facilitators" mean here, especially "roll up"?

Consulting dictionaries didn't help for me.