Why would the sons of liberty be a secret organization?
the group was made up of former criminals who did not want recognition.
the british had offered thousands of dollars for colonial leader's apprehension.
members were protesting in unlawful ways that could lead to arrest.
this organization had sent letters throughout the colonies and had to keep them secret.

The group was made up of a bunch of former criminals

And I Oop-

Hope Helps

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answer; i believe the two groups were irish immigrants and chinese immigrants;

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).