How is Spiritism organized?

Spiritism "is simultaneously a science of observation and a philosophical doctrine. As a practical science, it consists in the relations that can be established with spirits. As a philosophy, it entails all the moral consequences that result from such relations". It started in the 19th century by the French educator Hippolyte Léon Denizard Rivail, who, under the pen name Allan Kardec, wrote books on "the nature, origin, and destiny of spirits, and their relation with the corporeal world".

from the conditions of the working class in england by friedrich engels,the main idea is :