The NSA has forced Intel, AMD, and chip makers to backdoor their CPUs and allow them to access your computer even if it is "turned off"
(as long as it has access to electricity)

The NSA has also forced hardware manufacturers to backdoor their 'Random Number Generators', to allow them to break RSA encryption

American-made electronics transmit radio frequencies which allow the FBI and NSA to access your computer even if it's not connected to the internet

The NSA intercepts computers/laptops/phones purchased online and installs malware chips (see: ANT/TAO Catalog) on them before delivering it to you

If you are a "Person of Interest" the NSA is intercepting your mail, opening em up, and installing bugs on any electronics you order over the internet (e.g. TVs, microwaves, phones, video games, smart refrigerators)

The NSA has already broken Tor networks and can identify you and attack you if you use Tor; ISP companies like Verizon, AT&T, Comcast assist with this

Major American tech companies like Microsoft willingly provide the NSA advanced warnings of Zero-Day security vulnerabilities before revealing them to the public

The CIA can infect your car's control systems, which would allow them to remotely take it over and drive it

The CIA / MI5 can hack into all smart devices (like TVs and Alexa) connected to the internet and spy on you