Sending the masses of cadres to do manual work gives them an excellent
opportunity to study once again; this should be done by all cadres except those
who are too old, weak, ill or disabled. Cadres at work should also go group by
group to do manual work.
324  The May 7 Directive is a letter of Mao to Lin Biao calling the army to engage in production and mass work, as well as for workers, peasants and students to learn from the work of
each others. See pp. 270-271 of this volume.