It's not clear to what extent such a ruling has a basis in Cambodian law.
The Interior Minister said Cambodians who were found to have taken part in the campaign would be fined up to 20 million riels (about $5,000).
The Center for Strategic and International Studies report found that the Cambodian courts were the main tool used by the authorities to clamp down on civil society groups the authorities saw as challenging.
The four tycoons identified by Global Witness are Mong Reththy, Ly Yong Phat, Try Pheap and Lao Meng Khin.
The leaders pointed to the One Belt, One Road initiative, a Chinese initiative that will connect the economies of Southeast Asia with large infrastructure projects.
Three former opposition party officials in Battambang province have been reported to the National Election Committee by the ruling Cambodian People’s Party (CPP) over a post on Facebook in which they endorsed an election boycott known as the Clean Finger Campaign.
NEC has registered 107 domestic groups, which will be dominated by the Union of Youth Federations of Cambodia (UYFC), an organization led by Hun Many, the prime minister’s son and a lawmaker for the ruling Cambodian People’s Party (CPP).
Hang Puthea, NEC spokesman, said the messages were intended to remind political parties that they must comply with the law, adding that some political parties had already received fines for violations.
In a statement on Wednesday the ministry ordered commune and district officials to issue documents to voters whose identity cards may have been lost or damaged.
Global Witness is launching a campaign that exposes Prime Minister Hun Sen associates who have played a key role in controlling Cambodian politics and its economy in their favor.
The National Election Committee (NEC) increased the estimate from a previous figure of about 50,000, saying the observers were fairly evenly split between civil society groups and political party observers.
''My regret is the lateness of land reform. And solving land disputes…. [W]e should have given land titles to the people more speedily, but we delayed for 10 years giving land titles to the people,” Hun Sen said in a 2015 interview with American documentary filmmaker Robert H. Lieberman.
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