Thousands are arrested in compounds that rights organizations say are populated by victims of human trafficking.
Ta Muen Thom is the latest scene of heightened tension as Thailand and Cambodia border dispute continues.
The move will mandate military service beginning next year under a law on the books since 2006.
The decision in Cambodia’s National Assembly clears the way for officials to strip citizenship from dissidents.
Critics warn the amendment, which officials say is key to national security, would be used to squash dissent.
Amnesty documents torture, forced and child labor, human trafficking, and slavery in at least 53 scam compounds.
Thailand shut international crossing points this week as tensions rise a month after a 10-minute border clash.
Cambodia, meanwhile, suspends Thai fuel imports, as the tit-for-tat over a territorial dispute deepens.
Key coalition partner abandons Paetongtarn Shinawatra’s government over her June 15 call with Cambodia’s Hun Sen.
Cambodia bans imports of Thai fruit and veg, while Thailand bans its nationals from working in Poipet casinos.
