Consumers who lost money to a scammer using Western Union during the period January 1, 2004 and January 19, 2017, can now file a claim to apply for a refund.
The claim must be submitted by May 31, 2018.
More information on the scope etc under https://www.ftc.gov/enforcement/cases-proceedings/refunds/western-union-settlement-faqs
The procedure is open to non US-citizens as well.
This is the dedicated Western Union page: westernunionremission.com