What can concerned Canadians do about Israeli aggression?

“The tenant pondered. 'Funny how it is. If a man owns a little property, that property is him, it's part of him, and it's like him. If he owns property only so he can walk on it and handle it and be sad when it isn't doing well, and feel fine when the rain falls on it, that property is him, and some way he's bigger because he owns it. Even if he isn't successful he's big with his property. That is so.'
And the tenant pondered more. 'But let a man get property he doesn't see, or can't take time to get his fingers in, or can't be there to walk on it----why, then the property is the man. He can't do what he wants, he can't think what he wants. The property is the man, stronger than he is. And he is small, not big. Only his possessions are big----and he's the servant of his property. That is so, too.”
John Steinbeck, The Grapes of Wrath