Conversation so far:
What was Victor Jara's role in political activism?
Victor Jara supported  Salvador Allende, the Popular Unity coalition candidate for president.
What role did Victor Jara play in political activism?
In 1970, Victor Jara supported Allende, the Popular Unity coalition candidate for president, volunteering for political work and playing free concerts.

Question: Why did he support him?
Self-contained rewrite: Why did Victor Jara support Salvador Allende?