There are five different types of crowd that can be distinguished by their emotional content.

If you’ve ever been running late for work on a crowded commuter train that suddenly grinds to a halt, you might have experienced something like this:

As the train stops, there’s a shift in people’s behavior. Just seconds ago, everyone was immersed in their own small world; now, as frustration mounts, there’s suddenly a sense of togetherness. Everyone’s anger is directed at the same target and everyone wants the same thing – to get the train running again.

That’s a great example of how a crowd forms.

A crowd isn’t just a large number of people – it’s a mass in which members identify with one another. When that happens, people enter into something that’s greater than the sum of their individual parts: a crowd. In that moment, there’s a sense of equality. Every member enjoys the same standing, regardless of previous differences.

Those are the general traits of all crowds, but there are also specific types of crowds. In fact, there are five different kinds of crowd according to their emotional content.

Let’s start with the baiting crowd. This crowd has a clear objective – to kill its chosen target. A classic example is the crowd that called for the crucifixion of Jesus Christ.

Then there are flight crowds. These are formed when a group of people is faced with a common threat. Once the danger passes, however, the crowd dissolves.

Next are prohibition crowds. Their purpose is refusal – think of striking workers manning a picket line.

Reversal crowds are also rebellious, but their aim is to overturn existing power hierarchies. They form when slaves revolt against their masters or soldiers turn their weapons on their officers.  

Finally, there are feast crowds. Their purpose? Common and equal indulgence, typically in the form of lavish food-based festivals.

Let’s get back to what all these types of crowd have in common. There are four attributes that define all crowds.

The first is growth. Once a crowd exists, it tends to expand; it “wants” more people to join it.

Second is equality. As soon as a crowd has formed, all its members are equal.

Third, crowds are typically dense. Bodies are pressed up against each other, and nothing can stand in the way of this proximity or divide members from one another.

Finally, every crowd has a goal. Without a purpose, the crowd disperses and people become individuals concerned with their personal affairs once more. Once Jesus had been crucified, for example, the crowd that had been baying for his blood left the scene, and its members returned to their normal lives.