From "A Curator"

Sotheby's has locked out workers in the context of immense corporate profits. Details can be gleaned elsewhere.

I find myself working with Sothebys in my job, and am disturbed to know I am doing business with an anti-labor organization.

I would respond favorably to a challenge to propgressive sellers of art (collectors, museums and galleries) to insist that a portion of the premiums Sotheby's collects in auctions be redirected to the Teamsters or AFL/CIO. This can be insisted upon in giving consignments. If an entity usually pays 5% sellers premium, they can now insist that 2% of the 5% goes to AFLCIO. Or they can negotiate a lower premium and send the difference themselves. Given that Christies will usually match Sotheby's negotiated terms  in order to get
consignments, Sotheby's will lose consignments, or lose cash.

I am not in a position to PROPOSE this idea, but I am in a position to RESPOND to it if some individual or group can begin it.

Contacting high-level collectors might result in a much better response than you imagine. Many of them are real progressives....