Why did the author of the advertisement for the meeting in Chicago urge working people to rise up?

The author of the advertisement urged working people to rise up to address the injustices and inequalities they faced in the workplace and society. By rallying together, they aimed to empower workers to demand better wages, working conditions, and rights. The call to action was intended to inspire solidarity and collective action against oppressive systems, emphasizing the importance of unity in achieving social and economic change.