I will ask what I hope is a simple question.
A political club holds publicly advertised meetings. 2 people have been attending who, while they are not disrupting the meeting itself, are undermining the club daily, witnessed by many people. Members of the club are quitting because of them.
Is there a law that would allow the club leadership to bar these 2 individuals from attending the meetings?
As long as the denial of inclusion is not based on one of the federally listed criteria, i.e. race, etdc. for a club using public funds, it is okay. If they are not using public funds, then they can deny inclusion (in many instances) even for race, ethnicity, gender, etc.) Part of the right of assembly is the right to not assemble with those you choose not to.
Good luck