As Amazon continues its rise as the world’s largest online marketplace, rival eBay charges that it got there by crossing a legal line.

eBay filed a lawsuit against Amazon in Santa Clara County on Wednesday alleging it fraudulently poached its high-value sellers by infiltrating an internal messaging system called M2M, In the filing, Ebay says its rival is “unwilling to fairly compete for third party seller business.”

Amazon declined to comment on the lawsuit.

eBay says the Amazon “scheme” violated its user agreement policies and “induced eBay sellers to do the same.”

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