Package: fedora-usermgmt-core

"fedora-usermgmt-core" package binaries on CentOS:

/usr/sbin/fedora-groupadd /usr/sbin/fedora-groupdel /usr/sbin/fedora-useradd /usr/sbin/fedora-userdel

You may install this package on CentOS with yum install fedora-usermgmt-core