Such a group is not a PAC or a Super PAC, but anonymizes donors. It can be used as a vehicle to transfer money to a Super PAC while only naming the dark money group and keeping the donors secret.
> Garry’s List is structured as a 501(c)4 nonprofit, a tax designation that lets the group bankroll campaigns while affording donors a measure of secrecy they would not enjoy if giving directly. They are traditionally known as “dark-money” groups because they can spend on elections without revealing all their donors.
https://en.wikipedia.org/wiki/Dark_money
Such a group is not a PAC or a Super PAC, but anonymizes donors. It can be used as a vehicle to transfer money to a Super PAC while only naming the dark money group and keeping the donors secret.