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CHICAGO (TNS) — For nearly 30 years, Scabby the Rat, a giant inflatable balloon with sharp claws, a perpetual snarl and a menacing demeanor, has loomed over construction sites across Chicago and beyond to protest the hiring of nonunion labor.

Like deep dish pizza, skyscrapers and the Ferris Wheel, the giant inflatable rat is a Chicago creation that has found its way into the broader culture. Scabby had a memorable star turn on a “Sopranos” TV episode centered around a construction work stoppage.

But soon, Scabby the Rat — who comes in a variety of sizes and designs — may be out of work.

The National Labor Relations Board previously gave the giant rats a wide berth but it’s shifted its stance under the Trump administration. The board is weighing whether to crack down on their use, on the grounds that the rats may be scaring away customers from “neutral” businesses not involved in the labor dispute.

“Their use is unlawful under the (National Labor Relations) Act and not protected under the First Amendment because they are being used specifically to menace, intimidate and coerce in aid of an unlawful purpose,” Peter Robb, the NLRB’s general counsel, said in a brief filed last month in a case in Philadelphia.

Banning the rats not only would eliminate what has become the go-to protest symbol for many local unions, but it would also be a blow to Big Sky Balloons, a company in southwest suburban Plainfield, Ill., that created and manufactures Scabby.

Scabby was commissioned in 1990 by the bricklayers union in Chicago, which was looking for an eye-catching way to make its case against alleged unfair hiring practices. A protest icon was born, and rats as tall as 25 feet have been inflated at construction sites on behalf of a variety of trade unions ever since.

“Everybody in Chicago knows what the rat is and that somebody is on strike,” said James Allen, president of District Council 1 of the International Union of Bricklayers in Elmhurst, Ill. “Before, you could drive by and see six guys with picket signs and probably never notice them.”In addition to Scabby, Big Sky sells an assortment of giant inflatable vermin, including “Cockroach,” “Fat Cat” and “Greedy Pig,” all of which may be endangered by the pending NLRB case.