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Mr. Levin pointed out that the unions have separate funds for their political activities as required by law.

“However, as Landmark has demonstrated through various complaints in recent years, the extent to which these organizations appear to be blurring the line between legitimately exempt activity and taxable political activities is growing more and more troublesome,” he wrote.

His letter does not cite any specific violations by the unions, which are just starting to spend for the midterm elections.

The IRS’ Exempt Organizations Division is responsible for administering and enforcing the tax laws that apply to more than 1.8 million organizations recognized by the IRS as exempt from tax.