Sguon Samean is seen as “a courageous female commune chief” in Trapaing Chan commune, which is home to more than 6,000 villagers.
The Black Monday Campaign was created to advocate for the release of political prisoners in Cambodia.
The Overseas Press Club of Cambodia said in a statement that the move was “potentially dangerous and defamatory” and urged a retraction.
The case is due to be heard on June 8.
According to analysts, Hun Sen has not directly taken part in political campaigning since 1998.
Millions of Cambodians are due to take to the polls on June 4 to elect new local councilors and commune chiefs across more than 1,600 constituencies.
The forum covered entrepreneurship, the ‘digital revolution’, cross-border trade, and governance for greater collaboration between industry, government and civil society
According to the National Election Committee (NEC), some 8,000 disabled people have registered to vote.
Prime Minister Hun Sen has regularly warned of “civil war” if the ruling party loses power.
The peacekeepers who died during an ambush in the central African nation earlier this month were: Im Sam, Sieng Norin, Mom Tola and Mao Eng.
ASEAN’s economy has become the fifth-largest global market in recent years, and it is expected to become the fourth-largest market in the near future.