9. Canadian Labour Congess
The CLC is not a labor union but a union federation and the primary labor body in Canada, representing most of the labor unions in the country. The CLC warrants addition to our top 10 because of its propensity for supporting strikes; in 2009, no country lost more working days to labor disputes than Canada, a whopping 2.2 million days, well ahead of strike-crazy France (1.4 million days) and light years past her southern neighbor, the U.S. (120,000 days).
Membership: 3 million
Sticking it to the man: In 1961, trade unionists helped to establish the New Democratic Party, which would eventually pass the Medical Insurance Act and universal health care.