The Communists started out fighting for the rights of the workers - the underdogs exploited by the capitalists.
When the Communists become the ruling party in places such as China, the workers supposedly become the rulers. In reality, however, there is no such thing. Contrary to the party line, the workers remain the underdogs. The Communists themselves take over the role of the capitalists - they become both the rulers and the exploiters themselves!
In Hong Kong, there is another twist. The government is chosen by the Communists. But the capitalists - now backed by the Communists - continue to exploit the workers. Do the Communists fight for the workers now? Of course not. Who fight for the dock workers now? The non-Communist unions, students, and common citizens. Where are the Communist unions? Nowhere. They are the establishment now, remember? How can they fight against the capitalists? They are allies now.
Such is the truth exhibited by the dock workers’ strike. A sad commentary for Labor Day.