For most of the summer, a strike involving 600 union workers at five Connecticut nursing homes grew increasingly nasty, as accusations of retaliatory firings were met with claims of workers intentionally putting patient safety at risk.

Now, those accusations have risen to a level not typically seen in labor disputes — a lawsuit claiming the United Healthcare Workers East, SEIU 1199, and New England Health Care Employees unions committed extortion under RICO laws, which were created to fight organized crime.