L1-A to EB1-C - how big the US company should be to have good chance to apply for Eb1-C greencard for the employee?

This will vary and depend on also on size of foreign affiliated company, the job duties and title of your position, and the type of business. For...

What should my next step be? Will we forfeit this money?

It is not illegal to transport currency into the US, it is illegal to do so if it is not declared to US CBP. If currency is seized you can...

Can Canadian Citizens work as independent contractors in the US?

As noted, it may be possible if the Canadian has an E-1 or E-2 visa, and you hire his company. Similarly, there are some very limited situations...

Which government offices might contact me if I work as a self-employed person on a US website ("3rd party payment processor") ?

You've listed most of the agencies you may deal with. The income is effectively connected and subject to taxation. Depending on specifics the...

Possibly. You should definitely consult with a trademark attorney. As noted, if not attempting to create a derivative work that could be viewed...

Can I record audio of someone via a online messenger

It will depend on the state you are recording in and possibly the location o FB the person being recorded. Start with California law. Most...

Fbi is asking for pictures to help with a crime?

Also being cynical, since they "called" are you sure it's the FBI and how did they get your number? Something you may want to verify.

I'm a tenant and the injured party involving a boat crashing into mine while im away, does maritime law allow me to be evicted?

As the other attorneys correctly note, you need to have a maritime attorney review your dockage agreement. It will set out the prerequisites for...

When I sign an agreement but no law enforcement or judge was around, is the agreement legal?

Sorry it is not clear what type of agreement you are referring to, a settlement agreement? In any event, a contract does not require witnesses or...

Under the new labor law that considers teaching assistants as employees are international students also considered employees?

To answer this question requires more information than provided and you should consult with an immigration attorney. You may still be considered...