noun
prisoner of conscience
A person imprisoned for their beliefs, often used in human rights contexts.
彼は言論の自由を求めたために良心の囚人となった。
He became a prisoner of conscience for seeking freedom of speech.
政治犯 is a broader term for political prisoner, while 良心の囚人 specifically emphasizes imprisonment due to nonviolent beliefs or conscience.
Compound of 良心 (conscience) + の (possessive particle) + 囚人 (prisoner). The term is a direct translation of the English 'prisoner of conscience', popularized by Amnesty International.