Answer:
When the manifesto was published Febuary of 1848, the dramatic synthesis of communist ideology sparked a revolution. It was sent to be published in England, and shortly after, England banned the meeting of political parties of socialist and opposition groups of the monarchy. The idea of workers coming together to form a revolution was too dangerous.
It was so popular because it meant a whole new economic lifestyle for every individual, where everyone can have an equal pay and equal food etc. It gives the poor hope that they can be as equal as the rich before them. It believed that the working class would put an end to class society forever. It sounds perfect in theory, but it does not account for the corruption and unfairness of humankind. Marx's Manifesto was so influential, that by the 1050's nearly half the population was under communisms clench.
Hope this helps! Good luck! <3