the blind masses; the ignorant masses; the unenlightened masses
Figurative use: refers to the general public as lacking insight or knowledge, often in a critical or literary context. Common in the proverb 群盲象を評す (the blind men appraising an elephant).
There is a proverb: the blind men appraising an elephant.
many blind people
Original, literal meaning: a group of blind people. Now rare and mostly encountered in the proverb or in historical contexts.
A group of blind people gathered and talked about an elephant.
彼の意見は群盲の一人に過ぎない。
His opinion is merely that of one of the blind masses.