Concept:
J. S. Mill was a major liberal thinker.
He strongly supported individual liberty, equality and women's rights.
His famous work The Subjection of Women argues against the oppression and legal subordination of women.
Step 1: Understand Mill's view on women.
Mill believed that society loses great talent, intelligence and moral progress when women are repressed.
According to him, oppression of women is not only harmful to women but also harmful to the whole society.
Step 2: Understand why it is a loss to community.
If women are denied education, freedom and equal opportunity, then half of human capacity remains unused.
This prevents social progress.
Thus, repression of women becomes a loss for the entire community.
Step 3: Compare with other philosophers.
Aristotle, Locke and Hobbes discussed politics and society, but the given statement is especially connected with J. S. Mill's feminist and liberal thought.
Therefore:
\[
\boxed{\text{J. S. Mill}}
\]