Sign up for the MSNBC newsletter

You have been successfully added to our newsletter.

Let our news meet your inbox

José Díaz-Balart

How do 21st century terrorists communicate?

MSNBC’s Cal Perry explains how 21st century terrorists are communicating with each other through the “dark web.” Perry also explains the cyber war happening between the online hacker group, “Anonymous” and ISIS.

BEST OF MSNBC

Play All