Pasadena, California — After starting elementary school in the late 1960s, Naomi Hirahara and three other girls formed a clique called the C.L.A.N., an acronym that represented each of the girl’s first initials. Hirahara said she and her friends didn’t consider the racial implications of their group’s name until one of their fathers objected: “The Klan is very bad!” The group consisted of Hirahara…