Mr Corbyn has been a prominent force in the anti-war movement here in UK.
He can, perhaps, make a difference IF he get our/grassroots support.
He has a lot of enemies, including many in his own parliamentary party.

This is the website for UK StopWar;
http://stopwar.org.uk/

This is a couple of relevant articles;
http://stopwar.org.uk/news/how-the-anti-war-movement-can-stop-britain-b…
http://stopwar.org.uk/news/can-jeremy-corbyn-end-70-years-of-uk-subserv…

Independent petition ~ Britain must accept its fair share of refugees seeking safety in Europe;
https://www.change.org/p/david-cameron-britain-must-accept-its-fair-sha…

StopWar Petition
http://act.stopwar.org.uk/petition/donotbombsyria

Lobby Your MP;
http://act.stopwar.org.uk/postcode/

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They ( you know whoooo-ooo! ) will of course try to ignore any outcry, as they do.
The louder the outcry, the harder it is to ignore, they must at least respond/acknowledge.
And ... other people hear it too, and their awareness is raised.

Love always brothers sisters sisters brothers always Love.

xx