Answer:
Boycotts or buycotts by extension, and peaceful protests.
Explanation:
Assuming this is talking about MLK's protests as a whole, I'll explain these tactics and how he used them in broad strokes.
Boycott: withdraw from commercial or social relations with (a country, organization, or person) as a punishment or protest.
Boycotts are used as a demonstration to the public, the target organization, and other corporations of what the demonstrators want to change. They can accomplish change by ruining the company or organization's reputation, cutting into their sales, or buy a mass refusal to partake in said company's services, again, cutting into their sales.
Peaceful protests are mainly to start conversations and establish the protesters as a dignified, peaceful, and cogent force that should have their ideas taken into account.
