Non-Yank with a question for Yankie comrades.

I’ve recently been going back over Lenin’s writings, in particular What is to Be Done?:

We have said that there could not have been Social Democratic consciousness among the workers. It would have to be brought to them from without. The history of all countries shows that the working class, exclusively by its own efforts, is able to develop only trade union consciousness, i.e. the conviction that it is necessary to combine in unions, fight the employers, and strive to compel the government to pass necessary labour legislation etc

What do USAmerican Marxists think the current correct organisational strategies are, given the particular conditions of the US? What are the limits of activity within trade-unions, compared to other countries?