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Starting Sunday, Canadians will begin to see which third-party groups will be spending money to sway their votes in the upcoming federal election.

As of June 30, groups that aren’t political parties but want a say in the fall campaign will need to register with Elections Canada if they spend more than $500 on political activities, and file interim disclosure forms once they raise or spend more than $10,000.

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Groups such as Engage Canada and Shaping Canada’s Future stole the spotlight earlier this month with duelling ads during the NBA Finals (Engage Canada attacked the Conservatives; Shaping Canada’s Future went after Liberal Leader Justin Trudeau), while groups such as Canada Proud will likely be spending big in the coming months.

But more than half the more than $6 million directly spent on electioneering by third parties in the 2015 election was shelled out by the top 10 organizations, most of which are unions.