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Why do young Canadians join ISIS, and what can be done to prevent this?
Bill C-51 -- the Harper government's anti-terrorism act -- offers one approach: make it a crime to promote or advocate "terrorism." But a slippery slope leads from criminalizing extremist ideas to criminalizing dissent. Four former Canadian prime ministers, in a statement critical of Bill C-51, point out that "serious human rights abuses can occur in the name of maintaining national security."