Net neutrality activists and left-leaning interest groups are launching an online advertising campaigntargeting Google co-founders Larry Page and Sergey Brin for the company's recently announced agreement about web traffic delivery with Verizon Communications.

Google has long been a supporter of net neutrality – the idea that Internet providers can't deliberately block or slow data traffic – however the company's recent legislative proposalwith Verizon prompted some activists to suggest the search giant had sold out...