Bing found the following results
Marxism - Class Struggle, Capitalism, Revolution | Britannica
Class conflict - Wikipedia
Class struggle | sociology | Britannica
Karl Marx’s Theory of Class Struggle: The Working Class
1.2E: Class Conflict and Marx - Social Sci LibreTexts
Social class | Definition, Theories, & Facts | Britannica
Class and Class Struggle | The Oxford Handbook of Karl Marx
Class Conflict Definition & Explanation | Sociology Plus
Class Struggle: A Political and Philosophical History - Springer