He was labelled (as) a traitor by his former colleagues.

他被以前的同事称为叛徒。

《牛津词典》

He was a traitor. And he murdered someone in cold blood.

他是一个叛徒，而且他冷血地杀了人。

youdao

There is a traitor in our midst.

我们中间有个叛徒。

《牛津词典》

"To some people this building is the scene of a crime, where a murderer and a traitor was captured and brought to justice.

VOA: special.2009.11.06

They called him a traitor. Yet most people of the North accepted Webster's appeal for compromise.

VOA: special.2009.04.02

They called Cleveland a traitor to his party and to the American people.

VOA: special.2010.07.01

For some, Mr Gilmour is still remembered as a traitor who was guilty of betrayal.

BBC: IRA supergrass Raymond Gilmour 'abandoned' by MI5

After the 1993 Oslo Accords between Israel and the PLO, Iran abandoned Arafat as a traitor.

CENTERFORSECURITYPOLICY: Mugniyeh's true legacy

As leaders of Silicon Valley and Hollywood debark from their G6s in Sun Valley, a traitor has brought Bravo to nerdville.

FORBES: Hollywood, Silicon Valley At War in Sun Valley