Thirty people have been arrested during a United Mine Workers of America protest against Patriot Coal in West Virginia.
UMWA President Cecil Roberts and AFL-CIO Vice President Arlene Holt-Baker are among those arrested.
The UMWA says 5,000 people attended Tuesday's protest in Fairmont.
They came from Alabama, Illinois, Kentucky, Missouri, Ohio, Pennsylvania, Virginia and West Virginia.
Amendment 7 on Alabama's ballot looks like a simple measure to preserve the right to a secret ballot. In reality, it injects voters into a battle between labor and management.
The ballot measure provides that Alabama citizens have a fundamental right to vote for public office and employee representation by secret ballot.
If passed, it would prohibit unions from organizing by card check, where they get more than half of the employees at a company to check a box on a card saying they want union representation.