Okay kiddo, imagine you have a group of friends who all want to help each other out and make sure everyone is happy and healthy. That's kind of like what the Hebrew Socialist Union in London is all about.
The Hebrew Socialist Union is a group of people who come from Jewish backgrounds and believe in something called socialism. Socialism is when people work together to take care of everyone, instead of just worrying about themselves.
The people in this group live in London, which is a big city in England. They do things like have meetings, where they talk about how they can help other people who might not have everything they need. They might give money or resources to these people, or they might make plans to help them in other ways.
The reason they call themselves the Hebrew Socialist Union is because they follow Jewish traditions, and they believe in socialism. They want to help people who may have been treated unfairly or discriminated against because of their race or religion. And they want to do it in a way that helps everyone work together and feel equal.
So, in short, the Hebrew Socialist Union in London is a group of Jewish people who believe in socialism and want to help others who might be struggling or disadvantaged.