Contexto de Guns of Brixton

En que contexto histórico sucede la canción de The Clash The Guns of Brixton? Tengo curiosidad, aquí os dejo la letra:


When they kick out your front door
How you gonna come?
With your hands on your head
Or on the trigger of your gun

When the law break in
How you gonna go?
Shot down on the pavement
Or waiting on death row

You can crush us
You can bruise us
But you'll have to answer to
Oh, the guns of Brixton

The money feels good
And your life you like it well
But surely your time will come
As in heaven, as in hell

You see, he feels like Ivan
Born under the Brixton sun
His game is called survivin'
At the end of the harder they come

You know it means no mercy
They caught him with a gun
No need for the Black Maria
Goodbye to the Brixton sun

You can crush us
You can bruise us
Yes, even shoot us
But oh-the guns of Brixton

When they kick out your front door
How you gonna come?
With your hands on your head
Or on the trigger of your gun

You can crush us
You can bruise us
Yes, even shoot us
But oh-the guns of Brixton

Shot down on the pavement
Waiting in death row
His game is called survivin'
As in heaven as in hell

You can crush us
You can bruise us
But you'll have to answer to
Oh, the guns of Brixton