Why were the Syrian Rebels, the Kurds, Jabhat al-Nusra, and ISIS all labeled “opposition groups”? Who has been their common enemy?

Explanation:

The Syrian Civil War will enter its 10th year this year having began in March 2011. It has seen fighting between multiple forces in the country but in general it is a fight between the Government of Syria and several opposition groups mentioned above such as Rebel groups, Jihadists and Islamists and Kurds.

These opposition groups were/ are fighting to remove President Bashar al-Assad from power after he responded with violence to protests calling for him to be removed from power.

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