When given the choice most choose NOT to have their earnings automatically deducted for "dues."
Public Sector Unions
Top Contributors, 2013-2014
National Education Assn $24,960,749
American Fedn of St/Cnty/Munic Employees $9,988,870
American Federation of Teachers $4,391,881
American Federation of Govt Employees $4,072,005
International Assn of Fire Fighters $2,184,303
National Assn of Letter Carriers $2,113,796
American Postal Workers Union $1,007,341
National Rural Letter Carriers Assn $735,500
National Treasury Employees Union $681,550
National Active & Retired Federal Employees Assn $441,000
American Federation of Teachers Solidarity 527 $405,151
National Assn of Postal Supervisors $382,300
Aft Solidarity 527 $350,000
National Postal Mail Handlers Union $274,500
National Assn of Postmasters $230,400
Federal Aviation Admin Managers Assn $162,500
California School Employees Assn $127,015
National Assn/Farm Service Agency County Employees $71,500
Garden State Forward $65,000
Prof Engineers in California Government $64,190
Again look at overall Union members in the last 20 years. They are being phased out.