All of the leaders mentioned - Surya Sen, Jogesh Chandra Chatterjea, Bhagwati Charan Vohra, and Chandrashekhar Azad - were significant figures in the Indian national movement. However, the common factor between them is that they were all part of the non-violent struggle during the initial days of the movement.

Non-violent struggle during the initial days:
During the initial phase of the Indian national movement, leaders and activists focused on non-violent methods to protest against British rule. This approach was inspired by the philosophy of non-violence, popularized by Mahatma Gandhi. The leaders mentioned above were part of this non-violent struggle, which aimed to achieve independence through peaceful means.

- Surya Sen:
Surya Sen, also known as Masterda, was a prominent revolutionary from Bengal. He was a key figure in the Chittagong Armoury Raid of 1930. Although the raid involved armed resistance against the British, it was an exception to the non-violent approach followed by most leaders during that time. Surya Sen and his group were involved in armed action against the British, but this was not representative of his overall involvement in the national movement.

- Jogesh Chandra Chatterjea:
Jogesh Chandra Chatterjea was a freedom fighter from Bengal. He actively participated in the non-cooperation movement led by Mahatma Gandhi and played a significant role in organizing protests and spreading awareness about the movement.

- Bhagwati Charan Vohra:
Bhagwati Charan Vohra was a revolutionary and a member of the Hindustan Socialist Republican Association (HSRA). He was involved in various activities against British rule, including the Kakori train robbery in 1925. While Vohra was associated with revolutionary activities, it is important to note that he was part of the non-violent struggle during the initial days of the national movement.

- Chandrashekhar Azad:
Chandrashekhar Azad, also known as Azad, was a prominent revolutionary who played a crucial role in the freedom struggle. He was a member of the HSRA and participated in various acts of defiance against the British, including the Kakori train robbery. However, his commitment to the cause of Indian independence remained unwavering, and he actively supported and promoted non-violent methods during the initial days of the movement.

In conclusion, the common factor between Surya Sen, Jogesh Chandra Chatterjea, Bhagwati Charan Vohra, and Chandrashekhar Azad is that they were all part of the non-violent struggle during the initial days of the national movement. While some of them may have been associated with revolutionary activities later on, their contributions to the non-violent struggle cannot be overlooked.