All 9 Uses of

communism
in
The Phantom of the Opera

In this way also I discovered the road that led to the well and the dungeon—the Communists' dungeon—and also the trap-door that enabled Erik to go straight to the cellars below the stage.†
Chpt 21

communists = people who support an economic system that abolishes private ownership of property with the goal of a classless society

A few days later, what was not my amazement to learn by my own eyes and ears that Erik and Christine Daae saw each other and to catch the monster stooping over the little well, in the Communists' road and sprinkling the forehead of Christine Daae, who had fainted.†
Chpt 21

I spared you yesterday, in MY COMMUNISTS' ROAD; but I warn you, seriously, don't let me catch you there again!†
Chpt 21 *

Then you can hide in the lumber-room and you shall see Christine, who will have gone to her dressing-room, delighted to come back by the Communists' road...And, now, be off, for I must go and do some shopping!†
Chpt 21

However, I resolved to be extremely prudent, and did not make the mistake of returning to the shore of the lake, or of going by the Communists' road.†
Chpt 21

Ah, you see, daroga, I couldn't carry HIM up like that, at once.... He was a hostage ...But I could not keep him in the house on the lake, either, because of Christine; so I locked him up comfortably, I chained him up nicely—a whiff of the Mazenderan scent had left him as limp as a rag—in the Communists' dungeon, which is in the most deserted and remote part of the Opera, below the fifth cellar, where no one ever comes, and where no one ever hears you.†
Chpt 26

[1] On the other hand, I have discovered the secret passage of the Communists, the planking of which is falling to pieces in parts, and also the trap-door through which Raoul and the Persian penetrated into the cellars of the opera-house†
Chpt Epil.

In the Communists' dungeon, I noticed numbers of initials traced on the walls by the unfortunate people confined in it; and among these were an "R" and a "C." R. C.: Raoul de Chagny.†
Chpt Epil.

Definition:

an economic system that abolishes private ownership of property with the goal of a classless society