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Gov. Scott Walker was delivered a letter on Thursday from a law firm representing the AFL-CIO that asked the governor to stop using a logo of the labor organization without its authority.

The AFL-CIO is the American Federation of Labor and Congress of Industrial Organizations.

Walker used the AFL-CIO logo on his Facebook page for a time before it was taken down.

But the AFL-CIO say it was up long enough for the image to be picked up by Atlantic magazine.

“This is a clear show of disrespect for the AFL-CIO and the 250,000 working families it represents,” said Phil Neuenfeldt, president of the Wisconsin State AFL-CIO.

“When will Walker’s dirty trickery end?”

Here is a letter to Walker from a Washington, D.C law firm representing the union.

In a statement, Walker’s spokesman, Cullen Werwie, said:

"The AFLCIO sent us a letter threatening legal action because a picture of a bumper sticker that was given to the Governor in the last two months by a union member was posted online. Rather than waste taxpayer funds arguing over a picture of a bumper sticker that was posted on Facebook and Twitter a couple of weeks ago, we just decided to take it down."