You live in a condo and fourteen people are behind in assessment can the board put a lien on the unit owners who own the largest amount?

Sure--if you would like to retain a discrimination law attorney. If the board decides to file liens against delinquent condo owners, then it must file liens against all delinquent owners, not just some, unless there is a good reason (such as some owners have set up payment plans). Be sure that any offer to pay the delinquent fees without a lien is extended to all delinquent unit owners, and no delinquent unit owner gets a "better deal" than any other delinquent unit owner. Because attorney fees can be collected in lien filings (at least in my home state of WA), and lien filings can cost thousands in legal fees if not done correctly, see a real estate attorney right away.