In the secret orders there were enrolled over half a million men.
在秘密命令中，有超过 50 万人报名参加。
英语百科
List of general fraternities
（重定向自Secret order）
A fraternity or fraternal organization is an organized society of men associated together in an environment of companionship and brotherhood; dedicated to the intellectual, physical, and social development of its members. Some historically male-only organizations now include women.