From that book:
"Trotsky declared that "the militarisation of labour . . . is; the indispensable basic method for the organisation of our labour forces" . . . "Is it true that compulsory labour is always unproductive? . . . This is the most wretched and miserable liberal prejudice: chattel slavery too was productive". . . "Compulsory slave labour . . . was in its, time a progressive phenomenon". "Labour . . . obligatory for the whole country, compulsory for every worker, is the basis of socialism"