The boys and men who left their Greek valley and mountain villages in the early 1900s for America came with amulets their mothers had made for them. Some were miniature sacks attached to a necklace; more often they were merely a square of fabric enclosing the values of their lives: a piece of a holy book or a sliver of the True Cross representing their belief in Greek Orthodoxy; a thyme leaf denoting their wild terrain; a blue bead to ward off...