Home Secretary Priti Patel has announced she is seeking to declare the whole of Palestinian militant group Hamas a terrorist organisation.
The military wing of the group which controls Gaza is already proscribed a terrorist organisation by the UK.
However, the change will also cover the Islamist movement's political wing.
It is a criminal offence to belong to or invite support for a proscribed organisation or wear clothing which could be seen to support the group.
The penalty is a maximum of 14 years in prison and/or a fine.
A proscription order laid before Parliament on Friday will now be debated and, subject to approval, will come into force on 26 November.