Police say Steve Cassidy's car jumped a curb and crashed into a dumpster just before midnight Wednesday at 7th Avenue and 30th Street.
Cassidy was treated for minor injuries. No one else was hurt.
Police say Cassidy also had cocaine on him.
Cassidy left the union in 2016 to serve as executive director of the New York City Fire Pension Fund.
FDNY Commissioner Daniel Nigro issued the following statement:
"In light of the incident involving Stephen Cassidy last night and his subsequent arrest, effective immediately, I have removed him from his position as Executive Director of the New York City Fire Pension Fund."
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