http://www.unionfacts.com/articles/laborPractices.cfm

"When most people think of violations of labor law, they think first of "Big Business." But employees, employers, and labor organizations file thousands of charges each year“called "Unfair Labor Practices"“alleging violations of labor law by union officials.

The National Labor Relations Board's annual report for fiscal year 2005 included the number of Unfair Labor Practices alleged against employers and unions. Once again, union officials faced a disproportionately high number of allegations of wrongdoing, when compared to employers. The worst part: The vast majority of allegations said that members were the ones hurt by the union officials that are supposed to protect them.

The NLRB reported in 2005 that:
• Unions faced a total of 6,381 allegations
  
• 82% of charges against unions alleged illegal restraint and coercion of employees (by comparison, the leading allegation against employers — at 53% — was for refusal to bargain)
  
• 594 charges were for illegal union discrimination against employees
  
  

The NLRB reported in 2004 that:
• Unions faced a total of 6,917 allegations of wrongdoing
  
• 80% of those charges were filed by individuals
  
• Unions filed more than 100 charges against other unions
  
• 81% of charges alleged illegal restraint and coercion of employees

More than 600 charges alleged illegal discrimination against employees, an increase of about 6 percent from 2003.