Moscow city. May 19. Pioneer parade on Red Square, dedicated to the birthday of the pioneer organization named after V.I. Lenin. Old pioneers are walking along the square. Pioneers perform sports exercises. The pioneers of the 209th Moscow school assemble a boat with their own hands: they put the engine on, paint. Children are preparing for a hike along the Oka River. Classes of a culinary circle at the Kharkov confectionery factory. The boy knocks down the cream, the girls lay out the finished pies. Children in the classroom of the sculptors' circle in the Pyatniskiy House of Pioneers. Yunnats take care of the inhabitants of the Moscow Zoo. They feed the animals, write down their observations, carry the animals to the clinic.