I have set up multiple organizations and each organization has their own organization site.

Each organization site has my portlet on one of it's pages. I need to be able to access the organization ID in my portlet. i.e. when a user is viewing my portlet from the Organization 1 site page, I want to display organization 1 specific data. When he is viewing it from the Organization 2 page, I want to show organization 2 specific data.
For this, all I need is the organization ID. How do you do this?
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