Some Assorted Think Tanks With A Totally Leftist Agenda:

The Fabian Society.
Institute For Public Policy Research.
Demos.
Compass.
Progress.
CentreForum.
The Work Foundation.

Anything - and  I really do mean anything - supported as an idea by any of these bodies, whether they claim to be 'think tanks' or not, should be avoided like a dose of poison.

It is sickeningly interesting how often these are used by the BBC to make a point or  create a news item!