Answer:
1. Holocaust --- The systematic mass slaughter of European Jews and others in Nazi concentration camps during World War II
2. Socialism --- A system of social organization in which producing and distributing goods is owned collectively or by a centralized government
3. Bolshevik --- A member of the left-wing majority group of the Russian Social Democratic Workers' Party
4. Liberalism --- A political orientation that favors social progress by reform and by changing laws rather than by revolution
5. Genocide --- The systematic killing of a people group by another
6. Nationalism --- A strong sense of love and devotion toward a nation.
Explanation:
1- In History, it is identified with the name of Holocaust to the ethnic, political and religious genocide against the Jewish people that took place in Europe during the course of World War II under the regime of the Nazi Germany. The murders took place throughout all the territories occupied by Germany in Europe.
2- Socialism is a social and economic system characterized by control by society, organized with all its members, of both the means of production and the different forces of work applied in them.
3- The Bolsheviks were a radicalized political group within the Social Democratic Labor Party of Russia, led from the beginning by Vladimir Lenin, and later by Iosif Stalin.
4- Liberalism is a political current that places the internal and material development of human beings thinking about their social interaction at the center of their thinking. It is a political ideology that advocates that social welfare and social development are compatible with the freedom of their individuals.
5- Genocide is an international crime that includes any act perpetrated with the intent to destroy, in whole or in part, a national, ethnic, racial or religious group as such.
6- Nationalism is a thought that links an individual to his or her homeland. It is the feeling that a human being has for the home or adoptive land to which he feels bound by certain values, affections, culture and history.