They’d have to shut down facebook at the least, and probably the internet.
Consider all electronic communications compromised as of turn of the century. All your contacts by phone, email, blogs, classified ads, E-bay and so forth are easy pickings and likely already mapped by connection. Any noteworthy organization may be compromised by plants, or disgruntled members.
However, you have but to note successful operations exist for moving illicit goods, whether through skill or compromised adversaries. Adapting a proven strategy for organization and communication would have similar success but also any weaknesses inherent.