Mike Antonucci analyzed the 2015 tax filings and internal membership numbers for all state National Education Association (NEA) affiliates.  He found that union affiliates in Alabama, Indiana, Michigan, North Carolina, and Wisconsin were on the shakiest ground.  He writes,

The North Carolina Association of Educators lost 9.6 percent of its active members in 2015 and is only about half the size it was in 2010. It is now below the threshold for payroll deduction of dues set by state law, although enforcement of that provision seems to be a problem for the state.

NCAE ran a $690,000 deficit in 2015, and its employees claim they have not received a raise in eight years.

According to Antonucci, affiliates in Georgia, Iowa, and South Carolina are also in financial trouble.