The liberal effort to weaken the National Rifle Association moved to a new level Wednesday when the gun-rights group’s corporate sponsors were assailed for helping clear the way for the sale of weapons involved in last week’s Newton, Connecticut shootings.

The black activist group ColorofChange.org is leading the effort, similar to their other bid to force out sponsors of a legal group, the American Legislative Exchange Council, which champion’s so-called “Stand Your Ground,” or “Shoot First,” laws.