The Construction, Forestry, Mining and Energy Union's tactics have been turned on itself. Chris "chicken man" Kessaris - a disgruntled member and former election candidate - staged a one-man picket line and occupation of the union's Swanston Street office into the early hours of Thursday morning.

Mr Kessaris says the union's leadership reneged on a deal to help him with work if he did not run against them at the last elections. He was laid off after five months from a job the union had helped him get.

He earned the nickname "chicken man" after he followed former Victorian premier Jeff Kennett around in a chicken suit in the 1990s.

His appearances became so well-known that, when he ran against former CFMEU Victorian secretary Bill Oliver in 2008, his name was listed on the official ballot paper as: Kessaris, Chris (Chickenman).

Mr Kessaris told Fairfax Media he would resume his one-man picket at the union office on Thursday. He was removed by police at 2.30am after spending much of the night in the union office.

"They've been there too long," he said of the union's leadership. "They've forgotten what it's like to be on the ground."

He said it was curious that the union - which has been accused of corruption - was subject to a second royal commission in 12 years.

"I've had enough," he said. "It's about the way the union operates."

The CFMEU has been contacted for comment.