He was shadowed for a week by the secret police.

他被秘密警察盯梢了一个星期。

《牛津词典》

Many people denounced their neighbours to the secret police.

许多人向秘密警察告发自己的邻居。

《牛津词典》

He said the secret police had hit her.

他说秘密警察也殴打了她。

youdao

But the area is guarded by the Secret Service and Chicago police.

VOA: special.2009.01.12

They were on their way to attend a memorial service to commemorate the murder of some 22,000 Polish military officers and civilians who were massacred by the Soviet Union's secret police during World War II.

VOA: standard.2010.04.12

One memo the activists found showed that the secret police had monitored their Skype communications.

WSJ: Mideast Uses Western Tools to Battle the Skype Rebellion

She hated being called a spy, because that associated her with the Stasi, the secret police.

ECONOMIST: Ruth Werner, Soviet spy, died on July 7th, aged 93

My favorite sections were the replica empty shop and the secret police interrogation room.

FORBES: History's Witness: Prague, Communism, And The Socialist Ideal