Greek Prime Minister Alexis Tsipras on Wednesday faced down a major mutiny in his radical left Syriza party and violent protests in the streets of Athens to win parliamentary approval for the draconian reforms demanded in return for a new 86-billion-euro bailout package.
What is the relationship between 'Syriza' and 'Alexis Tsipras' in the context of the input sentence.
Options: chairperson, operator, platform, manufacturer