Whenever we talk about targeting companies, the first (maybe only) thing that most people think of is boycotting.
It is worth considering that the most successful social movement in the US, the most hated by power, the most vilified and most severely persecuted, was the labor movement.
The drive to organize workers to demand their rights against the owners of capital was the hardest fought and longest social struggle in American history; and it is almost completely ignored in school and popular media.
This was a struggle which successfully struck at the fundamental system of power, and therefore, must not be publicized.
We are taught instead about the Civil Rights movement (which was largely about implementing existing civil rights laws), and the tactics of the non-violent marches and sit-in campaigns of leaders like Martin Luther King; because in reality, these movements did not pose any significant challenge to the power structure, but mostly only challenged people’s attitudes.
The labor movement hit power exactly where power is vulnerable; in their economic interests. It is precisely because of the success of this movement that it must be kept obscure, and because it is kept obscure, most of us think the only way we can challenge companies is by using consumer boycotts; while in fact, this is the least of what we can do.