A D.C. author who co-wrote W. Mark Felts' 1979 memoir, in which the former top FBI official denied being the legendary Watergate source "Deep Throat," says in a lawsuit that he was tricked into signing away his rights to the work. Ralph de Toledano, in a lawsuit filed Monday in U.S. District Court here, states that Mr. Felt, his son and an attorney concealed their intention to disclose that Mr. Felt was indeed Deep Throat -- first in Vanity Fair magazine, then in a revised book. -snip- Mr. de Toledano says in his suit that California attorney John D. O'Connor...