Women who were once F.B.I. recruits sued the bureau on Wednesday, accusing it of running a “good-old-boy network” at its training academy that discriminates against women, in some cases because of race and disabilities in addition to gender, and sets them up to fail. Male instructors at the academy in Quantico, Va., exposed the women beginning in 2015 to a hostile work environment, sexual harassment and inappropriate jokes, according to the lawsuit. One woman said that an instructor referred to an African-American female trainee as “spaghetti head,” a reference to her braids. The woma