What is the difference between Nelson Mandela and Mahatma Gandhi?

The greatest difference between Nelson Mandela and Mahatma Gandhi was regarding non-violence. 

Mahatma Gandhi rejected the very idea of violent protests in favour of non-violence while Nelson Mandela was of the opinion that violent protests could be deployed if non-violence did not sway the government or when they would respond with unprecedented repression.

For more relevant articles, refer to the following links:

• Russian Revolution
• Key terms of the Russian Revolution
• October manifesto