勾连

hé dí rén gōu lián zài yī qǐ

和敌人勾连在一起

be in collaboration with the enemy

wǒ jué de tā gēn hēi shǒu dǎng yǒu gōu lián

我觉得他跟黑手党有勾连。

I think he's got involved with the Mafia.

tā men hù xiāng gōu lián gàn le bù shǎo huài shì

他们互相勾连，干了不少坏事。

They have ganged up with each other and done many evil things.