Notice how the name of the union is not mentioned in the article. It is SEIU.
Having worked over ten years as a director in a department where SEIU represented my employees, I despise that union. This is just business as usual for them.
The SEIU is a Marxist led/oriented union. A successor by mergers of older unions led by the Communist Party USA (such as Local 1199 chapters, Distributive Workers 65, NYC, some ILWU affiliates, and the leftist California and National Nurses Union, also UFWC - came out of the CPUSA/KGB influence Meatcutters and Butcherworkmens’ Union based in Chicago - Abe Feinglass, Pat Gorman, Charlie Hayes, etc).
Lots on these unions and their red pasts at www.keywiki.org. Search under the name of the union and/or the people mentioned above.