In an open letter to the public in late July, several retired Border Patrol agents wrote on behalf of the National Association of Former Border Patrol Officers to warn that Mexican drug cartels are actively operating inside the United States spending millions every year to try to build their networks here. They argued that American politicians are protecting their activities as well.

“Transnational criminal enterprises have annually invested millions of dollars to create and staff international drug and human smuggling networks inside the United States; thus it is no surprise that they continue to accelerate their efforts to get trusted representatives in place as a means to guarantee continued success,” the Border Patrol agents wrote.

“We must never lose sight of the fact that the United States is the market place for the bulk of transnational criminal businesses engaged in human trafficking and the smuggling, distribution and sale of illegal drugs. Organized crime on this scale we are speaking about cannot exist without political protection.”

Gene Wood, a retired Border Patrol agent who once ran the agency’s San Diego station; William Glenn, a retired Border Patrol southwest region Chief Intelligence Agent; and Claude Guyant, another retired Border Patrol agent who served in leadership positions throughout the agency in his time there, all signed the letter.

“Most heroin, cocaine, meth, and marijuana marketed in the United States is produced outside of our country, and then smuggled into the United States,” they wrote. “The placement of trusted foreign employees inside the United States is imperative to insure success in continuing to supply the demand, and returning the profits to the foreign organization. Members of these vicious transnational crime syndicates are already well established in more than 2,000 American cities and their numbers are increasing as networks expand and demands accelerate. These transnational criminals present a real and present danger to all Americans, and they live among us.”

As Breitbart News’ Brandon Darby reported on Wednesday, cartels are recruiting American teens, prison gang members and military members to become assassins for their organizations.

After they have been recruited and become part of these transnational criminal organizations, according to the former Border Patrol agents, those teens “are absolutely controlled and totally committed members of foreign drug cartels who have demonstrated an ability and willingness to follow the business model of criminal enterprise which is simply to supply the demand for illegal drugs and aliens in the United States and return the profits to their handlers abroad, at any cost.”

“Sanctuary cities established throughout the United States discourage even the most basic law enforcement initiatives within their boundaries against these predatory criminals,” they wrote. “Encouraged by Congress and a disinterested mainstream news media, these havens deny the American public their constitutional right to national security and public safety while providing relative safety for dangerous foreign criminals.”

The retired Border Patrol agents called on Congress to abandon efforts to grant amnesty to illegal aliens because passing an amnesty would be akin to abetting the drug cartels.

“Congress must abandon their focus on rewarding illegal behavior for millions of persons by the grant of amnesty in favor of protecting American citizens who suffer daily at the hands of these seasoned criminals,” they wrote. “To do otherwise makes a mockery of our laws, and encourages countless millions more from around the globe to do the same. Transnational organized crime nationwide has flourished under these conditions.”