Who was a member of the u. s.-backed mujahadeen?

Osama bin Laden was a member of the U.S.-backed Mujahadeen.

Osama bin Mohammed bin Awad bin Laden founded the pan-Islamic militant organization al-Qaeda. He was a Saudi Arabian until 1994, a member of the wealthy bin Laden family, and an ethnic Yemeni Kindite.

From 2001 to 2011, bin Laden was one of the most important targets  of the United States.

Bin Laden was on the American Federal Bureau of Investigation's (FBI) lists of Ten Most Wanted Fugitives and Most Wanted Terrorists for his involvement in the 1998 U.S. embassy bombings.

why was the national assembly formed by the third estate?

the estates-general had not been assembled since 1614, and its deputies drew up long lists of grievances and called for sweeping political and social reforms. the third estate, which had the most representatives, declared itself the national assembly and took an oath to force a new constitution on the king.