内外串通的商业行为用英语怎么说？

内外串通的商业行为

...collusive business practices.

collusive

adj. 共谋的；

例句
Any evidence of collusive behaviour by the banks could be sent to the Office of Fair Trading.
任何能证明银行有串通行为的证据都可以送交公平贸易部。

business

n. 商业，交易，生意，事务，业务，职业，行业；

例句
Many men still have difficulty accepting a woman as a business partner...
许多男性仍然无法接受女性商业伙伴。

practices

n. 练习( practice的名词复数 )，实践，（医生或律师的）业务，惯例；

例句
Many of its practices seem anachronistic.
它的很多习俗显得落伍过时。