Eno Gajda, 58, will be sentenced next month after the vessel was intercepted off Portland.
Hampshire Police has put a dispersal order in place in part of the town until 20:00 GMT.
There was a heavy police presence for the marches by the Kent Nationalist Movement and its opponents.
Energy secretary says she "didn't get it right" over comments she made about a TV interview.
A two-week crackdown targeted organised immigration crime at Cairnryan in Dumfries and Galloway.
The Chinese restaurant lost its licence in September after officers found illegal workers there.
Mohammad Alias Yousaf made his claim to an undercover reporter posing as a mini-mart owner.
Because of our investigation, the home secretary has ordered a review of how fines are issued and collected.
Use our interactive tracker to explore the latest migration statistics for the UK
