Actually, the libertarian socialists of the 19th century were self identified as left wing, that is, in favor of the smallest government possible.

The original designation of "Right" and "Left" was based on affinity for the monarchic, aristocratic traditional government (RIGHT), vs a more populist, local, small scale way of governing (LEFT)

If you go by affinity for centralized power (not necessarily government) you'll find that inevitably, the strongest call for centralized power is from the RIght.

What has confused so many people is that the Left, in America, has recognized that without strong government pushback, unregulated capitalism inevitably leads to centralized power.

There is state socialism, which is essentially a Right wing phenomenon, whether Stalin, Mao or Hitler, and there is decentralized socialism, which finds its most beautiful expression in the Catholic doctrine of subsidiarity, which was perhaps most eloquently described by E. F. Schumacher in several different writings.