The fact is that U.S. unions have to comply with government regulations all the time. Some of the laws are relatively straightforward and reasonable, some are less so. But the issue here isn't protecting the Teamsters from the hands of the government. Rather it is to maintain and extend the gains of union democracy that made the IBT qualitatively more independent of both organized crime and the employers. That view seriously misrepresents the state of the labor movement today, where most unions readily collaborate with both government and employer.
Indictments are possible.
But diverting the members' money is a serious offense against the democratic rights of the membership. Only by overlooking the actual evidence. It's as if many left-wingers don't think the actual charges, the actual evidence, matters. We simply can't gloss over the evidence. It deprives the membership of its hard-won right to vote for the leadership of its own choosing.