The flow of trade into Basra has slowed and hundreds of people over the past two weeks have taken to the streets in protest after the federal government imposed higher customs tariffs.On Jan. 18, the government began enforcing a customs law, which was ratified back in 2010 but was previously not implemented. Importers who had been used to paying a tax of between 3 to 5 percent of the value of their goods suddenly saw those rates skyrocket, threatening their profit margins and causing some t…