The Communications Workers of America (CWA) has filed an unfair labor practice charge against eBay-owned TCGplayer on behalf of workers at the trading card marketplace. The organization says TCGplayer supervisors and managers, including founder and CEO Chedy Hampson, illegally surveilled union activity in recent weeks.

Workers at TCGplayer are trying to unionze and this week, a supermajority filed for a union representation election. If they're successful, they'll form TCG Union/CWA, which will be the first union within eBay.