Thousands of pounds worth of illegal merchandise was seized from outside a McBusted concert at ACC Liverpool.
Two officers from the council’s street nuisance team joined with police in an operation which saw £3,500 worth of t-shirts, posters, lanyards and hoodies taken from unlicensed traders.
Four people will be summonsed for street trading offences.
Councillor Tim Moore, cabinet member, said: “This was a successful operation and sends out a message to unlicensed traders that their activities will not be tolerated.
“They hit at legitimate traders and people who buy from them should be aware that there are no guarantees about the quality of the goods and their rights are not protected.”