PORT-DE-PAIX, Haiti — Gang retaliation after a late-September security operation in Gros-Morne, Artibonite, has disrupted the movement of goods and fuel along National Road 5 (RN5), driving up transportation costs and prices in Haiti’s Northwest, according to merchants and transporters, who urge law enforcement authorities to take concrete action. “Since the operation carried out by the Gang Suppression Force, the gang members have become much m…