The Ghadr (Ghadar) was a

States Lala Hardayal settled in San Francisco and founded the Pacific Coast Hindustan Association (popularly called Ghadar) and that the party published the journal Ghadar beginning publication from San Francisco.

A student could combine this with basic geography (San Francisco on the US west coast) and the fact that a movement publishing its journal from a city suggests an organizational base there, to judge plausibility of a San Francisco headquarters.

Explicitly says the Ghadr Party was organised around a weekly newspaper with its headquarters at San (fragment continues to San Francisco in related snippet).

Use the pattern that revolutionary diasporic movements often center where their press is located to infer that a newspaper-centred group likely had its headquarters where the paper was produced.

Notes branches along the US coast and Far East and that activists reached there by 1911, culminating in establishment of the Ghadr in 1913 (context implies US/West Coast base).

A student could map the mentioned coastal branches and infer a Pacific-coast hub (San Francisco) consistent with a headquarters there.

Says the United States of America and Canada had established the Ghadar Party in 1913 and describes its international membership and revolutionary aims.

Combine this rule/example (Ghadar formed in North America in 1913) with city-level evidence to assess whether San Francisco is a plausible headquarter location for a North American-based revolutionary association.