Which Constitutional Amendment Act substituted the words 'any other purpose' in Article 226, modifying the writ jurisdiction of High Courts, which was later largely restored by the 44th Amendment?

The 'Drain of Wealth' theory was propounded by which Indian nationalist leader?

Which event is considered the turning point in Mahatma Gandhi's leadership in the Indian independence movement?

Which African leader is known for his non-violent opposition to colonial rule?