MONTREAL - A former high-ranking union official was arrested today at the Quebec-U.S. border.

The senior official at the Quebec Federation of Labour's construction wing was briefly detained at the border crossing at Lacolle, Que., and released under a promise to appear in court at a later date.

Jocelyn Dupuis had been sought by authorities on fraud and forgery charges, and a warrant was issued for him on March 10.

Dupuis was vacationing in the United States and police were waiting for him to return.

Dupuis faces three charges -- one each of fraud, forging documents, and of counselling another person to commit forgery.

The Crown alleges Dupuis defrauded the construction wing of more than $5,000 between Dec. 2, 2007, and Nov. 11, 2008.

He is also accused of producing 208 false documents, related to 39 weekly expense accounts and 169 restaurant bills.

The Quebec Federation of Labour is the largest union in the province and its construction wing represents about 70,000 workers.

Dupuis was director-general of the organization for 11 years but was forced to resign in 2008 after it was revealed he'd managed to incur $125,000 in expenses over a six-month period.