NPR correspondent Margot Adler's commitment to political causes began in her childhood: she grew up in a household of communist sympathizers during the McCarthy era. As a student at Berkeley, she continued her activism. During this time, she exchanged letters with an American soldier in Vietnam. Her life in the sixties is the subject of her memoir, "Heretic's Heart: A Journey Through Spirit and Revolution." (Beacon Press) Adler is now an expert on witchcraft and paganism.