Not to pick sides but so much is made about how bad the IAM....
Four of the last eight Teamsters presidents have been indicted according to the FBI
A 1999 Congressional report accused the Teamsters, under Carey's leadership, of "misuse of union assets, misrepresentation of the IBT's financial affairs, questionable transactions, and illegal activities during the 1996 IBT election, all at the expense of the rank-and-file."
A 2002 article in the generally pro-union New Republic magazine noted that the IBT is "still plagued by corruption; ex-felons and people with reputed mob associations lurk around the edges of key Teamster locals seeking influence over the union
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Glass houses
Wow....
IAM...
Allegations Filed
Duty of Fair Representation 719
Other Allegations 147
Union Security Related (including Beck) 115
Union Security Related 87
Coercive Statements 24
Threatening Statements 17
Harassment 16
Bad Faith/Surface Bargaining (Succeeding Contract) 10
Resignation of Membership (Patternmakers) 9
Disparagement of Employee 7
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IBT
Allegations Filed
Duty of Fair Representation 3,415
Other Allegations 1,167
Union Security Related (including Beck) 349
Threatening Statements 221
Actions of Picketers 206
Union Security Related 193
Coercive Statements 175
Statements 161
Bad Faith/Surface Bargaining (Succeeding Contract) 153
Hiring Halls 131