Grassroots Leadership's Rebecca Sanchez says families and other civil rights groups are concerned.
"It is really devastating. We know of a lot of folks who did not go to work today because of that threat it's going to happen right after the Fourth of July holiday. We know of a lot of folks thinking of new routes to work, trying to figure out alternative ways to live their day-to-day lives," Sanchez said.
Now, Grassroots Leadership members are working around the clock to prepare families who may be targeted.
"We are being super proactive. If you are approached, if somebody comes knocking on your door, don't answer it, don't let your kids answer the doors. Be vigilant, and exercise your right to remain silent as much as possible," Sanchez said.