Step 1: Understanding the Concept:
The question asks to identify the organization founded by the Indian revolutionary Lala Hardayal.
Step 2: Detailed Explanation:
\[\begin{array}{rl} \bullet & \text{Ghadar Party: This was a revolutionary organization founded primarily by expatriate Indians in the United States and Canada with the aim of liberating India from British rule. Lala Hardayal was a key founder of the party in 1913. } \\ \bullet & \text{Home Rule League: The Home Rule movement in India was led by Annie Besant and Bal Gangadhar Tilak in 1916. } \\ \bullet & \text{Communist Party of India: Founded in the 1920s, with M. N. Roy being a key figure in its formation. } \\ \bullet & \text{Brahmo Samaj: A social-religious reform movement founded by Raja Ram Mohan Roy in 1828. } \\ \end{array}\]
Step 3: Final Answer:
Lala Hardayal was a founder of the Ghadar Party.