Query: What English organization did John Williams belong to?
Context: Mission work in Samoa had begun in late 1830 by John Williams, of the London Missionary Society arriving in Sapapali'i from The Cook Islands and Tahiti. According to Barbara A. West, "The Samoans were also known to engage in ‘headhunting', a ritual of war in which a warrior took the head of his slain opponent to give to his leader, thus proving his bravery."