strip someone of his citizenship

strip A of B
AからBを取り去る［奪う・剥奪する］

strip someone of
（人）から～を剥奪する

strip someone of all his clothes
（人）を丸裸にする

strip someone of clothes
（人）の着物を剥ぐ

strip someone of his citizenship
（人）の市民権を剥奪する

strip someone of his clothes
（人）の着衣をはぎ取る

strip someone of his elected post
（人）の当選を無効にする

strip someone of his money
（人）から金を奪う［奪い取る］