A room full of women trying hard to emulate the "real danger" present in the master poster hanging in the background. It looks like some kind of class, like a high school or college art class.
They can all work on the same poster because they are making multiple prints at the same time. To be honest, that many people working on multiple prints at the same time may be faster and more efficient than doing a machine with the technology of the day. Not to mention the fact that while a machine requires valuable resources, many would be willing to make such a point to support the war effort.
The propaganda is most famous in the form of war posters. But at its core, it is a method of communication that aims to influence the attitude of a community towards some cause or situation, and this is not necessarily a bad thing.
Although propaganda is often used to manipulate human emotions by selectively displaying facts, it can also be very effective in conveying messages.