Illegal protection markets still require advertising despite legal constraints.

Evidence

If reputation is important, advertising is correspondingly vital to the protection industry. For obvious reasons, however, advertising in illegal markets is problematic—but far from impossible. — Diego Gambetta, The Sicilian Mafia The Business of…, 121

Categorization

• XREF: Connects to the reader’s private-enforcement framework: even extralegal governance needs a marketing channel, paralleling how the Champagne Fairs or diamond bourses signal reliability.