[thenewwazoo]

Law enforcement’s sole societal function is to protect capital and the capitalist class.

[dragonwriter]

Law enforcement’s sole societal function is to serve the interests of the ruling class.

In a capitalist (and, with some qualifications, in a predominantly capitalist mixed economy) society, that is protecting capital and the capitalist class, but that’s a product of context.

[marcosdumay]

It's an ok simplification. The ruling class always controls the capital, so there isn't much difference to any other society.

(And when the ruling class doesn't control the capital, you don't get a clear class division.)