An article at Sarah Hoyt’s site by Bill Reader has some answers. Read the whole thing; the basic answer is “the Central American Left,” but here are some details that might especially interest you:

…Barolo Fuentes, a Honduran socialist who was one of the frontmen for this caravan, and his friends in the LIBRE party; Pueblo sin Fronteras, a project of the Chicago-Based 501c La Familia Latina Unida; and a brief look at Venezuela, recently highlighted by Vice President Pence and currently in the spotlight as a possible funding source for all this…

…So, this wasn’t just nondescript social activism, but someone who has deliberately and repeatedly assisted specifically with illegal immigration…

La Tribuna picks up the story above in more detail, and describes [Fuentes] as having organized caravans since 1999. They note also that he is an “ex-deputy” in the National Congress of Honduras, for a group called Libertad y Refundación (Freedom and Refoundation) AKA LIBRE for short. The Honduran government is unicameral, but he was essentially the local equivalent of a senator/representative. Who is LIBRE? Why, they’re a Leftist Political Party in Honduras. They were founded in 2011 by the National Popular Resistance Front/ National People’s Resistance Front (FNRP). LIBRE was christened by Manuel Zelaya, the Honduran president who was deposed in a coup in 2009…

Zelaya, 2009, Honduras. Does that ring a bell? It should, if you’ve been reading this blog since then, because I wrote about Zelaya a lot. The context was that Obama supported him. If you want to refresh your memory just do a search on this blog for “Zelaya,” but the article with the most information is probably this one. There are plenty of others.

Then, from the Reader article, we also have this:

All of this suggests that the original organization of the caravan was indeed put together in Honduras—specifically, by people from LIBRE. The question is, did it stay that way?

To begin to answer that question, we turn our attention to Pueblo Sin Fronteras. To understand that group, first we need to get to know another group— La Familia Latina Unida, an extension of the pro-illegal immigration advocacy 501c out of Chicago, Centro Sin Fronteras. La Familia Latina Unida, in turn, is the organization that runs Pueblo Sin Fronteras. So, to be clear, Centro Sin Fronteras begat La Familia Latina Unida, which begat Pueblo Sin Fronteras. Pueblos Sin Fronteras may not be familiar to you, but their handiwork is—they organized the last caravan which came to the US in April, though that caravan mostly dissolved before it actually reached the border. According to Influence Watch, Centro Sin Fronteras was founded by Emma Lozano, a Chicago pastor and sister of left-wing community organizer Rudy Lozano, in 1987…

Centro Sin Fronteras is currently running on the back of grants from the Public Welfare Foundation, and the Wieboldt Foundation—certainly Left-Wing funding organizations, though surprisingly, not directly tied to George Soros. That said, Centro Sin Fronteras, you will perhaps be interested to hear, has been a beneficiary of the National Immigration Forum, which in turn receives donations from the Open Society Foundation, which of course is George Soros’ baby. The last donation was modest and back in 2010, though. I mention it to highlight what Trump has highlighted, and what a lot of those on the Right who have paid attention have known forever— in liberal charitable donation wankery, all roads eventually lead to Soros. The group apparently hasn’t been amazingly good about regularity in tax filings recently, so it’s hard to say how they’re doing of late.