Wisconsin unions, and perhaps unions nationwide, will be watching closely the results of an upcoming Supreme Court case that will be heard January 11. The Supreme Court will determine whether to prohibit any requirement that government workers pay fees to the unions that represent them. Since 2011, Wisconsin labor leaders have been struggling to maintain union membership, due to Wisconsin governor Scott Walker limiting local union bargaining power with the enactment of Act 10. AFSCME (American Federation of State, County and Municipal Employees) has been making an effort nationwide to increase union membership, especially if the Supreme Court rules against “fair share fee” requirements.
See "Wisconsin's public-sector unions plot fightback as Supreme Court case looms", Steven Greenhouse, The Guardian, January 4, 2016