Communism, hailed by Marx as a human evolution capstone, was anticipated to bring equality as well as harmony among, not only countries, but to the whole world. Class struggles and exploitation were to be eradicated, and economic growth were to advance. Nonetheless, communism achieved or accomplished limited success and greatly failed in each country or state that had established it. Many factors caused this failure or collapse, from inherent flaws within the communism theory to gross misuse of power or authority by communist leaders.
Communism in practice was unable to offer the gains it promised within the theory as the majority of people were dissatisfied by not being allowed to solely own property. If one owned a farm, farm animals, or land, that ownership was transferred to the community or rather the government. In addition, people were forced to work in their alienated land. Besides, many were against forbidding the practice of religion.
Communist leaders practiced corruption and one had to pay a bribe to achieve simple things. For example, parents bribed teachers or instructors for their children to pass grades and such grades made no difference if one needed to join good college. What matters was whom one knew and who one could bribe. It was useless to show up at the office of a doctor without gifts or bribe.
In summary, the whole system failed when the administration or government went bankrupt from inherent flaws within the communism theory to gross misuse of power or authority by communist leaders. People started to revolt, though, at that moment, the Communist leaders had nothing to embezzle and were forced to surrender after destroying everything.