The two groups and fellow netizens attacked the websites by constantly pressing the F5 key on computer keyboards to refresh the Web pages, causing long delays and crashes.
V for Vendetta has been reactivated to oppose the military-installed government.
The government is not being truthful about the purpose of the national referendum, the group said.
V for Vendetta said its members would vote against the charter in the referendum. In 2013, the group had called on the military to oust the Shinawatra government.
Its symbol, a white mask, is inspired by the movie “V for Vendetta” (2005), which depicted a people’s movement against a corrupt government. The anti-single gateway group came into existence late last year when the government proposed the move, which was widely seen as an attempt to crack down on anti-military groups.
In a related development, yesterday’s planned silent protest at the BTS Chong Nonsi skywalk failed to materialise after only one person showed up.
That person, Sirawith Serithiwat, barely spent a minute at the site unsuccessfully calling for people to stand beside him. Clearly upset, Sirawith called the activity off, saying: “If no one joins me…