What to do when one of four members of an LLC drains bank account and maxes out the company credit card>

The 3 members need to hire a business litlgator, who needs to send a demand letter to this member, or maybe just go directly to a lawsuit against this thief on the members' behalf and on the LLC's behalf, for breach of fiduciary duty, conversion, etc.

If your LLC has a written Operating Agreement, there should be a breach of that as well, as it no doubt prohibited any member from taking actions contrary to the best interests of the LLC. There may be dispute resolution procedures set out there, so you need to have a lawyer review it.

Disclaimer: Please note that this answer does not constitute legal advice, and should not be relied on, since each state has different laws, each situation is fact specific, and it is impossible to evaluate a legal problem without a comprehensive consultation and review of all the facts and documents at issue. This answer does not create an attorney-client relationship.

To add to what was said before, in addition to the operating agreement, your attorney should be well versed in state partnership and corporate dispute law (statutory and case law). Each state has a body of legislation and case law that may significantly impact the options and pitfalls surrounding a dispute between members (delinquent or otherwise). For example, in NY there is a significant body of case law that is constantly affecting the outcome of these and other disputes.

Good luck.

Disclaimer: This answer is for informational purposes only and does not constitute general or specific legal advice, nor create an attorney client relationship.