Who was the founder of ghadar party?

That's an excellent question, and the answer is more nuanced than a single name. The Ghadar Party was truly a collective effort. While many were involved, Sohan Singh Bhakna is widely regarded as the founding president. He was instrumental in bringing people together.

However, the intellectual driving force was Lala Har Dayal. He served as the General Secretary and spearheaded the party's ideology through its revolutionary newspaper.

The organisation was established by Punjabi Indian immigrants on the Pacific Coast of North America in 1913. So, it's best to see it as a joint effort, with Bhakna as the key leader and Har Dayal as the chief architect of its revolutionary mission.