Contractors buy through prescribed stores to erase mafia transaction trails. [causal]
But another, larger contractor said his firm opted for purchasing supplies at the prescribed stores because this left no trace of their transactions with mafiosi (I-1).
XREF: Parallels the logic of money laundering and anonymous financial trails — clean intermediaries deliberately obscure direct criminal connections.
Diego Gambetta, The Sicilian Mafia The Busi…, loc. 416