Toll collectors at the Erskine Bridge, west Scotland, struck for the second time last week over pay.
And they were furious that the Scottish Executive, dominated by New Labour, approved using a private security firm to scab on the strike.
About 30 strikers, who are in the T&G union, picketed near toll booths, manned by a private security firm, and got support from passing motorists.
One woman striker said, “We are disgusted our boss has gone on holiday while we are giving up our wages to stand on a picket line.”
The toll collectors want a pay rise of 42p an hour to achieve a rate of £5.50p, but bosses have refused to give more than 20p.
APCOA Parking drafted in security guards to collect the 60p tolls. A T&G spokesman said it was “astonishing” the Scottish Executive had approved the use of a private security firm to operate the toll booths.
APCOA Parking collects £5 million in tolls a year for the Executive, which pays the firm an annual fee of £625,000.