He is also facing a 10-year jail term for posting a border map on his party's website he says proves Vietnamese land encroachment.
Cambodge Soir began as a thrice-weekly paper in May 1995, and within two years it had gone daily.
Residents have made complaints to City Hall, the National Assembly, the Senate and the Council of Ministers.
This BarCamp was Cambodia's third annual gathering, but it has seen a doubling in attendance since 2008.
The intervention this week by Prime Minister Hun Sen in a series of labor disputes could please workers but upset investors.
Cambodia owes the US some $300 million, plus fees, in debt incurred during the Lon Nol regime of the 1970s.
Seventeen factories have cases against labor leaders, claiming the September strike was illegal.