The Flemish dealers who habitually engaged in the English trade were organized among themselves in a company or league known as the "Flemish Hanse of London." A considerable number of towns held such membership in the organization that their citizens could take part in the trade and share in the benefits and privileges of the society, and no citizen of these towns could trade in England without paying the dues and submitting himself to the rules of the Hanse. The export trade from England to the Netherlands was controlled from the English side by the system known as the "Staple." From early times it had been customary to gather English standard products in certain towns in England or abroad for sale. These towns were known as "staples" or "staple towns," and wool, woolfells, leather, tin, and lead, the goods most extensively exported, were known as "staple goods." Subsequently the government took control of the matter, and appointed a certain town in the Netherlands to which staple goods must be sent in the first place when they were exported from England. Later certain towns in England were appointed as staple towns, where all goods of the kinds mentioned above should be taken to be registered, weighed, and taxed before exportation. Just at the close of the period under discussion, in 1354, a careful organization was given to the system of staple towns in England, by which in each of the ten or twelve towns to which staple goods must be brought for exportation, a Mayor of the Staple and two Constables were elected by the "merchants of the staple," native and foreign. These officials had a number of duties, some of them more particularly in the interest of the king and treasury, others in the interest of the foreign merchants, still others merely for the preservation of good order and the enforcement of justice. The law merchant was made the basis of judgment, and every effort made to grant protection to foreigners and at the same time secure the financial interests of the government. But the policy of the government was by no means consistent. Both before and after this date, the whole system of staples was repeatedly abolished for a time and the whole trade in these articles thrown open. Again, the location of the staple towns was shifted from England to the continent and again back to England. Eventually, in 1363, the staple came to be established at Calais, and all "staplers," or exporters of staple goods from England, were forced to give bonds that their cargoes would be taken direct to Calais to be sold.