Why is red the color of socialism?

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1. #represent
2. #dates
3. #workers
4. #communism
5. #french
6. #against
7. #socialism
8. #which
9. #revolution
10. #colour
11. #symbol
12. #struggle
13. #century
14. #revolutions
15. #capitalism
16. #chosen
17. #extension
18. #blood
19. #oldest