http://www.reuters.com/article/2013/08/05/us-dea-sod-idUSBRE97409R20130805/

U.S. directs agents to cover up program used to investigate Americans

Although these cases rarely involve national security issues, documents reviewed by Reuters show that law enforcement agents have been directed to conceal how such investigations truly begin - not only from defense lawyers but also sometimes from prosecutors and judges.

The undated documents show that federal agents are trained to "recreate" the investigative trail to effectively cover up where the information originated, a practice that some experts say violates a defendant's Constitutional right to a fair trial.

http://www.americanmafia.com/Feature_Articles_271.html

The nephews of Gaetano Badalamenti operated pizzerias - and distributed heroin - out of small mid-western towns. The Sicilians dominated the heroin trade, while the American mobsters received a cut for allowing the Sicilians to operate in their territory. Manufacturers of cheese, olive oil and tomatoes could also be useful export vehicles for smuggling drugs into the United States. Joe Pistone, an FBI agent who infiltrated the Bonanno family, quoted one Bonanno member: The zips are Sicilians brought into this country to distribute heroin. They set up pizza parlors, where they received and distributed heroin, laundered money. The zips were clannish and secretive - the meanest killers in the business.