Okay kiddo, so there was a group of Jewish workers in a city called Vienna a long time ago. They called themselves "der jüdische arbeiter," which means "the Jewish worker" in German. They believed that Jewish people needed to have their own group to fight for their rights as workers because they were often mistreated by bosses who didn't like them just because of their religion.
You know how you have a group of friends who like to play together and have sleepovers? Well, these Jewish workers were like that. They would meet up and talk about how they could make things better for other Jewish workers. They wanted everyone to be treated fairly and for their bosses to pay them enough money to live on.
But some people didn't like this group. They thought it was wrong for Jewish people to only stick together and not mix with everyone else. They even thought that Jewish people were bad and shouldn't be allowed to work with everyone else. This was called anti-Semitism, which means people who don't like Jewish people for no good reason.
The Jewish workers in Vienna didn't let this stop them though. They kept fighting for their rights and eventually, things did get better for Jewish workers all over the world. So, remember kiddo, it's always important to stand up for what's right, even if some people don't like it.