What resistance strategies did the ANC spearhead from the late 1940s to the early 1960s?

It was in the 1940s that the ANC, or African National Congress, changed its strategies in the resistance of Apartheid. Instead of moderate strategies, like petitioning the government, the ANC adopts a program of mass action, which includes strikes and other forms of civil disobedience. In fact, the ANC called this their “Programme of Action,” and it represents a turning point in its history.
The ANC was involved in general strikes, for example, in 1950 and 1951. It also led the Defiance Campaign of 1952 which was the largest non-violent resistance effort against Apartheid laws in African history. In 1955, the ANC was involved in preventing the removal of black citizens from parts of Johannesburg.
It is also worth noting that it was in the 1940s that the ANC began admitting women into the party. A youth league was also created. So, in terms of resistance strategies, we can argue that one strategy was increased diversity. By accepting women and young people into its ranks, the ANC shifted its focus and developed a whole-society strategy. By doing this, membership greatly increased, enabling the ANC to take a leading role in anti-Apartheid resistance.
For more information on specific activities, have a look at the timeline in Reference 1.