South African organizations criticize government's silence
Law calls for death penalty for 'aggravated homosexuality'
MPs approved statute last year
Plaintiff couples sought spousal immigration rights
Muharami Hassan Nayonga arrested on April 13
Advocacy group hopes to legally register
Measure still contains death penalty provision
Kakuma and Dadaab refugee camps are located in the country
Bill contains death penalty provision for 'aggravated homosexuality'
'Aggravated homosexuality' would be punishable by death
