barbed wire close-up against a blue sky, the concept of incarceration, serving a sentence, restriction of freedom, isolation, crim

aged barbed barrier black blue border boundary chain close cloud concept concrete crime cross danger dark dusk empty fence freedom grunge grungy guard gulag immigration imprisonment incarceration iron isolated isolation jail liberty metal military obstacle penitentiary prison prisoner private protection punishment refugee restriction safety security sentence serving sharp silhouette sky steel sundown symbol wall war weathered wire