The committee members will not disclose the content of these logs to parties not involved in the dispute. It doesn't sound to me like it's likely that someone could log conversations on the channel without being on the channel. Kicking a list member off the channel is a last resort. Send a polite private message to the user asking them to cease the problem behavior. Always explain the reason for the rule when possible.
People are usually willing to abide by the rules if they understand why they are there.
Attempt to resolve the problem by talking to the person. Always bear in mind that the user could be someone who is just learning IRC, does not know how to send a private message, and might need help understanding what's going on or how to reply. Sometimes just quiet support is sufficient. If in doubt, it's always good op etiquette to defer to an op with seniority. If a non-list members shows up on the channel, politely explain that this is a private channel and ask them to leave.