I am trying to remove the Everyone group entirely. I can do a chmod +a to add, but whenever I do the -a all it does is remove the rights whereas I want to remove it in its entirety. I seen the chmod -D option, but I don't want to wipe out everything.

drwxrwx--- + 5 root wheel 64 Sep 17 08:37 app
OWNER: user:root
GROUP: group:wheel
0: user:root allow dir_gen_read,dir_gen_write,dir_gen_execute,std_write_dac,delete_child
1: group:wheel allow dir_gen_read,dir_gen_write,dir_gen_execute,delete_child
2: group:Administrators allow dir_gen_all,object_inherit,container_inherit
3: everyone allow std_read_dac,std_synchronize,dir_read_attr