Long ago, many people lived under hard rules. 

Long ago, many people lived under hard rules. 
Some leaders were not kind to their people. They made rules that caused much harm. This led to many people dying. 
People died from hunger and hard work. Some were even sent away from home. This was a very sad time.
Many people died in different lands. Some leaders in China and Russia caused this. 
Today, we build monuments to remember them. We learn about these hard times. It helps us know our history.
During the 20th century, many people died under communist rules. 
These deaths happened in many ways. Some people died from hunger. Others died from hard work or prison. Some were sent away from their homes. 
Many places saw these sad events. These included the Soviet Union and China. Cambodia also had a time of great loss. Experts study these events to learn why they happened. Some think the political system caused them. Others think the leaders were to blame.
It is hard to know the exact number of deaths. Some studies say 10 to 20 million people died. Other studies say as many as 148 million died. 
Scholars use many names for these events. They use words like "mass killing" or "genocide." A "genocide" is a very specific type of mass killing. Some experts call these events "crimes against humanity." This term describes attacks on many civilians. Today, many cities have monuments. These help us remember the people who were lost. 
During the 20th century, many people died under communist governments. 

Scholars use many different words to describe these events. One term is democide, which means a government intentionally kills its own people. Another term is classicide, which means killing an entire social class. Some historians use the term crimes against humanity. This describes attacks on civilian populations that hurt humanity as a whole. There is also the word genocide. This usually refers to killing specific ethnic groups. The United Nations has a special rule called the Genocide Convention. However, this rule does not always cover political or social groups. 
Many specific places and times are studied by historians. In the Soviet Union, people died during the Great Purge. There was also a famine from 1930 to 1933. In the People's Republic of China, the Great Chinese Famine occurred. This happened during a time called the Great Leap Forward. In Cambodia, the Khmer Rouge caused a genocide. These events are often studied to see if the political system caused the deaths. Some experts think the individual leaders were the main cause instead.
It is very hard to know exactly how many people died. Different experts have very different numbers. Some estimates say the total is between 10 and 20 million people. Other studies suggest the number could be as high as 148 million. 
Learning about this history helps us understand the world today. Many cities around the world have built special monuments. You can find these monuments in almost all the capitals of Eastern Europe. They are also in many other cities across the globe. 
During the 20th century, many mass killings occurred under communist regimes. 

Scholars use many specific terms to describe these killings. One term is democide, which political scientist Rudolph Rummel defined as intentional killing by government agents. This includes deaths from forced labor or concentration camps. Another term is classicide, which sociologist Michael Mann used for killing entire social classes. This is narrower than genocide because it targets social status rather than ethnicity. Some historians prefer the term crimes against humanity. This term describes attacks on civilian populations that affect humanity as a whole.
There is also a distinction regarding the term genocide. Under the United Nations Genocide Convention, genocide usually applies to ethnic groups. The convention does not specifically protect political or social groups. This happened because the Soviet Union feared limitations on suppressing internal disturbances. Because of this, researchers often use terms like politicide or geno-politicide. These terms include the killing of political or economic groups. Some experts also use the term mass killing to describe the death of many noncombatants. Benjamin Valentino defines a massive number as at least 50,000 deaths within five years. 
Historians have identified several specific historical events and locations. In the Soviet Union, the Great Purge and the famine of 1930–1933 are major examples. In the People's Republic of China, the Great Chinese Famine occurred during the Great Leap Forward. The Cultural Revolution is another period of study in China. In Democratic Kampuchea, now known as Cambodia, the Khmer Rouge committed a genocide. 
Calculating the total number of victims is a difficult task. Estimates of total deaths vary widely among different researchers. Some scholars provide a low estimate of 10 to 20 million people. Other estimates are much higher, reaching as many as 148 million. 
There are many academic debates regarding the connection between politics and these deaths. Some view the link between communism and mass killing as a causal relationship. This perspective is often used as an indictment of the ideology itself. Other scholars criticize this view as being too simplistic or rooted in anti-communism. There is also discussion regarding the term "red holocaust." Some historians argue this term can be used to compare these events to the Nazi regime. Others worry this might undermine the specific history of the Jewish people. These debates show how complex it is to categorize historical violence.
Learning about this history helps society remember the victims. Monuments to those who suffered under communist regimes exist in many places. You can find these in almost all capitals in Eastern Europe. They are also located in many other cities around the world. 
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