Some firms have reached agreements to cut workers' pay below the level set in their contract, a practice that is illegal in Germany.

有些公司已达成一致意见将工人的工资削减到低于合同中规定的水平，这种做法在德国是违法的。

《柯林斯英汉双解大词典》

The court sustained his claim that the contract was illegal.

法庭支持他的观点，认定该合同不合法。

《牛津词典》

But I don't think that is illegal. "Had he ever met a player under contract at another club?" not without the permission of the club.

所以我不否认自己也和有合同在身的其他俱乐部球员有过接触，但我从来不会在未经对方俱乐部允许的情况下去这样做。

youdao

It's against the law. It's an illegal contract.

因为那是违法的,这是个无效合同

耶鲁公开课 - 博弈论课程节选

It's illegal, so they can't sign that as a contract, but they they can just agree to do it.

因为是违法的,合同也就无效了,不过他们可以私下达成默契

耶鲁公开课 - 博弈论课程节选

It's illegal to sign an agreement, to sign a contract saying you're going to restrict quantities.

签订这样限制产量的协议,属于违法行为

耶鲁公开课 - 博弈论课程节选

Meanwhile, bidders commit to "take all measures necessary to prevent corrupt practices, unfair means and illegal activities" for bidding or while executing the contract.

WSJ: India to Ask Investment Banks to Sign Integrity Pacts

"First of all, I would expect the manager of England to know the rules and know that it is illegal to do that, because the player is under contract, " said Moyes.

BBC: SPORT | Football | My Club | Everton | Moyes realistic over Rooney

One way to address this issue, therefore, is to force student-athletes to sign a contract which will hold them financially liable if they are found guilty of accepting illegal benefits.

FORBES: Financial Penalties, Law Enforcement, NFL Involvement Would Reduce Cheating in College Athletics