The head of controversial drug rehabilitation service Shalom House says he will resign so he can speak out against "mass migration".

The Christian-based registered charity was once dubbed the "strictest" in Australia due to its uncompromising regime , including a requirement participants sign over their legal rights to financial decisions.

The program is run by former drug dealer and addict Peter Lyndon-James, and does not receive any government funding.

Mr Lyndon-James has been an outspoken critic of "mass migration", appearing at anti-immigration rallies, and posting to social media.

"As a Shalom community, we (the staff & residents) have taken an informed view: MASS Migration must stop," he wrote last week.

But in a post on social media on Sunday night, Mr Lyndon-James apolog

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