Urgent questions of the day. Unemployment movement, factory organization, fluctuating membership Piatnitsky, O., 'Urgent Questions of the Day. Unemployment Movement, Factory Organization, Fluctuating Membership', Modern Books Ltd. (London). 'This pamphlet is a slightly revised and abbreviated report of a speech delivered by Comrade O. Piatnitsky, on the first item of the Agenda of the XI Plenum of the E.C.C.I. [Executive Committee of the Communist International] on March 31st, 1931'. c.1931