Around 40 people demonstrated outside BBC Wales in Cardiff
Protesters gathered outside BBC Wales headquarters to voice their anger about British National Party leader Nick Griffin's appearance on Question Time.
Around 40 people demonstrated at the offices in Llandaff, Cardiff, on Thursday afternoon.
Members of Unite Against Fascism were joined by local politicians including Cardiff North Labour MP Julie Morgan.
Protests have taken place outside BBC buildings in London, Bristol, Glasgow, Liverpool, Nottingham and Belfast.
Mrs Morgan said of the Cardiff demonstration: "This is a peaceful protest. I think you have much more force if you protest peacefully.
"I don't support breaking through security. I understand people get very angry and very upset, but to resort to that type of action I don't think is acceptable."
Anti-fascist protesters broke into BBC Television centre in London and about 25 people were thrown out by police.
BBC Deputy Director General Mark Byford earlier defended the BBC's decision to invite Mr Griffin, whose party gained its first Euro MPs this year, on to the flagship political programme.
He said: "They should have the right to be heard, be challenged, and for the public who take part in Question Time and the viewers to make up their own minds about the views of the BNP.
"It's not for the BBC to censor and say they can't be on."