In any group there were always those who wanted to challenge the system.

A lawsuit challenging the system is to be heard this winter.

But some Chinese argue that even the poor are better off and therefore will not challenge the system.

But if any entity challenges the system, it is more likely to be the drug companies the federal government.

The organization also brought litigation to challenge the "white primary" system in the South.

Still, experience suggests that advocates will soon find new ways to challenge the system.

He was the first person to openly challenge the system.

"This is a way to challenge the system to untangle itself and begin to move."

She had not intended to challenge the political system, nor, apparently, did her director or anyone on the trial committee.

Why challenge the system when you can own the system?