As team members contribute, their ideas fosters an environment where everyone feels safe and they know they won't be blamed, criticized, or shamed for contributing a poor idea.
That said, if you're leading a team in English, there are some common cultural values you're likely to find, and these include direct idea exchanges with obvious invitations to contribute.
Brown won the support of a group of Abolitionist leaders. They formed a secret committee and called themselves the Secret Six. They agreed to advise Brown and, more importantly, to raise one thousand dollars for him.