Classes are underway at schools across Alberta for about 750,000 students after a three-week teachers’ strike. The provincial government used the notwithstanding clause to force teachers back to work. »»» Subscribe to CBC News to watch more videos: http://bit.ly/1RreYWS For breaking news, video, audio and in-depth coverage: https://www.cbc.ca/news Follow CBC News on TikTok: https://www.tiktok.com/@cbcnews Subscribe to CBC News on Snapchat: https://bit.ly/3leaWsr Download the CBC News app for