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Canada can revoke the Canadian citizenship of dual nationals convicted of terrorism or other high crimes under a controversial new law.

The law, which went into effect Friday, would revoke citizenship for anyone found guilty of terrorism, treason and spying for a foreign government.

The rules would also apply to dual citizens who take up arms against Canada by fighting in a foreign army or joining an international terrorist organization.

Prime Minister Stephen Harper has been ramping up anti-terrorism measures ahead of a federal election in October.

The new law has met with strong public criticism, and two Ontario lawyers have already launched a court case arguing it is unconstitutional.