Roy Piechocki has been wanted by Interpol since 2011 for sexually exploiting a minor in the US.
The five victims in Oxford were aged between 13 and 15 when the offences started.
The majority of the 413 photos, capturing moments from two early US shows, were previously unseen.
Brexit activist Shahmir Sanni claims the campaign used the group BeLeave to overspend.
In a conference speech, Adam Price called Wales "a wealthy country whose people live in poverty".