Which community organizations or mosques supported Mamdani's early activism?

1. College activism: Students for Justice in Palestine as an early organizing base

Mamdani’s political education began in progressive campus activism: Time reports he co-founded a Students for Justice in Palestine chapter at Bowdoin College, marking one of the earliest documented organizational anchors of his activism ^[1]. That genesis explains later emphasis in his career on Palestinian solidarity and criticism of Israeli government policy, which remain prominent themes in coverage of his politics ^[1].

2. Grassroots, multicultural volunteers rather than a single mosque network

Profiles of Mamdani’s campaign and movement repeatedly describe a decentralized, multi‑demographic volunteer base — from Bangladeshi elder women to queer youth and tattooed teens — suggesting his early activism and later campaign were driven by broad community organizing rather than being centered on one mosque or formal Muslim institution ^{[3] [2]}. Common Dreams and the Times of India pieces highlight this eclectic grassroots coalition without attributing his rise to a named mosque ^{[2] [3]}.

3. Democratic Socialists of America as a political home and organizing partner

Reporting states that Mamdani has encouraged supporters to join the Democratic Socialists of America (DSA) and that the DSA functioned as a political home and organizing vehicle for him; his movement launched a group, Our Time for an Affordable NYC, to keep that grassroots energy active while governing ^[2]. This indicates that formal progressive organizations — notably DSA — were important to his organizing trajectory beyond campus activism ^[2].

4. What the press names — and what it does not

Major outlets in the provided set name Students for Justice in Palestine and DSA as clear organizational touchstones in Mamdani’s early political life ^{[1] [2]}. However, the sources do not list specific mosques, Islamic centers, or named Muslim community organizations that formally supported his early activism; available sources do not mention any particular mosque backing his formative organizing ^{[2] [1]}.

5. Alternative perspectives and why they matter

Some coverage frames Mamdani’s background as rooted in progressive activism and labor/affordability politics rather than identity‑based religious institutions; critics and watchdog groups (e.g., ADL) have focused on his policy positions and rhetoric about Israel rather than on mosque ties, prompting monitoring and debate about the implications for Jewish and other communities ^[4]. Meanwhile, supporters emphasize broad community mobilization and grassroots democratic‑socialist networks as the legitimate base of his ascent ^{[2] [5]}.

6. Implicit agendas in reporting to note

Profiles emphasizing Students for Justice in Palestine or DSA may be aiming to place Mamdani on the left–progressive map for readers; outlets focused on security or communal tensions highlight ADL concern and his criticism of Israel, which can serve advocacy or watchdog agendas ^{[1] [4]}. Conversely, progressive outlets underscore his grassroots coalition and continuity from campus organizing to citywide movement, framing him as a product of community power-building ^[2].

7. Bottom line for your question

Based on the provided reporting, the clearest named organizations tied to Mamdani’s early activism are the Students for Justice in Palestine chapter he co‑founded at Bowdoin (college organizing) and later alignment with the Democratic Socialists of America and grassroots groups that formed his campaign movement; the sources do not identify specific mosques or Muslim community organizations as formal supporters of his early activism ^{[1] [2] [3]}.