For Socialism to able able to advance unhindered, an unarmed citizenry is a must.
What did the NAZI party do first?
the National Socialist German Workers’ Party?
Outlaw all private handguns? - Why?
Most oppressive regimes outlawed or restricted firearm ownership. It's one of the early chapters in the "Despot's Guide to Complete Power," and on the quick check list in Appendix A.