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You have still bigger problem in this sentence, they can refer to either employers or to workers. It is dangling so should be more clearly defined as per GMAT rules. You are correct about Congress being singular.
Check out this awesome article about Anderson on Poets Quants, http://poetsandquants.com/2015/01/02/uclas-anderson-school-morphs-into-a-friendly-tech-hub/ . Anderson is a great place! Sorry for the lack of updates recently. I...