OK, the phrase is "hive-minded", which means the crowd behaves like a single entity (like a hive of bees). I think an equal expression in Spanish would be "consciencia colectiva"?

I was thinking of the Borg as well! :D

Hive mind means a collective, or people who think the same/act the same/behave the same. If you are familiar with Star Trek, the Borg had a hive mind - what one thought, they all thought at the same time. It's a way of saying the people had no individual thoughts, no independence. they act like a colony of social insects acting as a single organism, each insect performing a specific role for the good of the group.

ok: "this hive minded crowd of a million plus people"

This is not a common expression. Do you have a full sentence?