1syuzh. - Germany. October 10, 1931 Berlin. 8th World Congress of Mezhrabpom: delegates, presidium in the meeting room. K. Zetkin and others are speaking. 2syuzh. - Moscow. Plant "Sharikopodshipnik": work in the shops, meeting. 3syuzh. - Moscow. Members of the commission, engineers, inventors are present during the tests of various automatic couplings of a freight train. 4syuzh. - Leningrad. Optical and Mechanical Plant named after OGPU: manufacturing of parts, assembling cameras, checking finished products. Workers are signing up for a government loan.