The group was considered to be a risk to national security.

这伙人被认为是威胁国家安全的危险分子。

《牛津词典》

The former National Security Agency operative doesn't fancy talking in a Moscow restaurant so - via an intermediary - we settle on meeting in my hotel and risk the room service.

这位美国国家安全局的前工作人员不想在莫斯科的哪一家餐厅谈话，因此，通过一位中间人，我们决定就在我住的酒店碰面，冒险尝试一下客房服务。

youdao

The real truth will not be given, but even so to claim that national security was at risk is patently untrue, as we have never instigated any ACTS of aggression against you.

“真相”不能被给予，由于“国家安全部”把这视作一个威胁，当然不是真实的，我们从未表现过“侵略”你们的行为意图。

youdao

"National security is something that is at risk. And that is why what we are trying to do is ensure that our networks our government networks, our private sector networks have the ability to withstand these attempts to hack in and to conduct activities."

VOA: standard.2010.02.07

Claiming that he posed a national security risk in Britain too, Britain sought to send him back to India.

ECONOMIST: Torture and deportation

Such infiltration, however, remains a genuine national security risk, as has been thoroughly documented by investigative journalist Todd Bensman.

CENTERFORSECURITYPOLICY: Green Borders

Mr Obama has decided not to publish photos of Bin Laden's body, saying the images could pose a national security risk.

BBC: Bin Laden death: Barack Obama at Ground Zero