The dairy industry. Milk is big business. Shipments have skimmers who will save up milk from several runs and sell it cheap to one or two places and claim small amounts of loss here and there. My father was an account manager for a huge multi-state dairy and the schemes people use to steal from the company are quite insane. Some of it was Arabs raising money for the "cause" basically terrorism through their gas stations from Chicago to Detroit. People turned up dead, committed suicide... could have been a fucking movie.