1) Ban 2) Criminalise 3) Illegalise 1) Criminalise 2) Criminalize 3) Declare illegal 4) Disallow 5) Forbid 6) Illegalise 7) Interdict 8) Outlaw 9) Prohibit 10) Proscribe 11) To make illegal 12) Veto 
• (v. t.) To make or declare illegal or unlawful.
Il·le'gal·ize transitive verb [ imperfect & past participle Illegalized ; present participle & verbal noun Illegalizing .] To make or declare illegal or unlawful. 
illegalize To render illegal.
to make illegal: They even wanted to illegalize smoking.