Oct 7 (Reuters) - Canada on Friday said it would ban the top leadership of Iran's Islamic Revolutionary Guard Corps (IRGC) from entering the country and promised more targeted sanctions over the treatment of women in Iran and the downing of a civilian airliner in 2020.Register now for FREE unlimited access to Reuters.comCanada plans to expand targeted sanctions measures and establish a sanctions bureau, Prime Minister Justin Trudeau and his deputy Chrystia Freeland announced at a news conference on Friday.The IRGC, a powerful faction that controls a business empire as well as elite armed and intelligence forces in Iran, has been accused by Western nations of carrying out a global terrorist campaign.Listing the IRGC as a terrorist organization would have been an act of the domestic criminal code, risking unintended consequences and would have been impractical, a government source told Reuters."1,000 days ago, IRGC terrorists shot down a commercial flight killing more than 50 Canadians," New Conservative leader Pierre Poilievre said on Tuesday."