NEW measures to outlaw the glorification of terrorism and distribution of terrorist publications came into force today.
The Terrorism Act 2006 enables groups to be banned for those offences.
The controversial anti-terror plans faced stiff opposition in the House of Lords before they finally became law, while some lawyers questioned the legal definition of glorification.
Peers rejected the proposals five times before voting them through.
Seventeen Labour MPs voted with the Conservatives and Liberal Democrats against the measures.
The glorification proposal was introduced after the July 7 London bombings last year as part of a package of measures by Prime Minister Tony Blair to clamp down on `preachers of hate'.
Civil liberties campaigners and opposition politicians said such actions were already banned. They also said innocent people could be caught up in the ban.
The act also creates new offences of undertaking terrorism training and preparing or planning a terrorist act.