Wrongful termination and salary due what action can I take

I joined a start up along my one friend on 7th march. we were working there with full potential but after one month some mis-understanding arised between my friend and co-founder. Another employee of the same company was not happy with the behavior of the co-founder.My friend and he decided to leave the job.but that guy betrayed my friend and told whole story to co-founder.when he heard,he asked my friend as well as me to resign on 5th may.we didn't get salary for the month of April.co-founder is saying that Indisciplinary action is taken.No salary will be dispersed.can we take legal action?