Can employers discriminate against you for being part of a class action lawsuit against your former employer?

Can employers discriminate against you for being part of a class action lawsuit against your former employer?
In general employees can discriminate for any reason other than those specified in the Civil Rights Act of 1964, which stipulates:

Title VII of the Civil Rights Act of 1964 (Title VII) prohibits employment discrimination based on race, color, religion, sex, or national origin.

So technically an employer could discriminate based on most anything you could imagine.

Practically speaking, how would an employer ever be aware that a potential employee was part of a class action lawsuit? This strikes me as an unwise topic to bring up during an interview. Definitely not the thing to add when the interviewer asks about anything else you'd care to share.