A fifth member of the group was imprisoned in March following a bomb hoax.
They were also involved in a fake kidnapping at Tate Britain in July 2015.
All four were also sentenced to eight weeks for the fake kidnapping at Tate Britain, to run concurrently.
The men then turned to leave the gallery with framed artwork, giving the impression of a robbery.
The actions of these five men were outrageous.
The group terrified those visiting the galleries.
However, no robbery had taken place.
The men had arrived at the gallery with artwork props, which they showed as they made off.
They advanced to do the same at the Tate Gallery later that afternoon.
Light said the group hoped to continue but would re-evaluate their approach.
source: www.techworm.net
