Employee Joining Client Company

Hello,
Can an employer take legal action against an employee for joining the client location.
Keeping in mind the current market situation and companies situation are these clauses valid?
My counters for the above statements are as follows:
1. What if the employer terminates/releases the employee for not having enough projects?
2. What if the employee has been on bench for past 8 months?
3. Whats if the employer is changing the company policies as per current market situation?
4.Why to stay with an employer who can layoff at any point of time?
Please can any one suggest whether the above statements be valid if such a situation arrives or still the employer can take legal actions and what are the extreme consequences.
Thank you,
Maddy

Thank you for the reply and sorry for not being specific.
Here it goes, while I was joining current employer there was a clause in the documents that I cannot join any client company of the current employer for 2 years after leaving the organisation.
But I have been on BENCH(with out any work i.e., non billable) for the past 6 months.If at all company decides to layoff non billable employees I might also be in the list.
Now company has already sent employees to home saying that only 50% of basic would be payed untill a project is allocated to them else after 6 months employee would be asked to leave organisation.
Now I am not been asked to go home at the moment but I anticipate that I will also be asked to go home if the company does not get enough projects.
At this situation of crisis does the clause("cannot join organisation for 2 years) has anything to do if I shift to the client company.
Please advise.