They are often the group that organise protest for various left wing cause and typically a lot of non members who also align with them of whatever issue attuned making the protest larger, non members most often outnumber the PSL core

This is jusr one example of a protest organised by the party to oppose the US enabling the genocide In Gaza, and many non party members who also oppose genocide attended https://medillonthehill.medill.northwestern.edu/2024/05/photos-workers-join-students-in-protesting-for-a-free-palestine-at-the-socialist-may-day-march/ they really many I'd you want to find info on other actions ggeyve organised

If you read coverage about protests about left issues anti police brutality, anti racism, anti genocide etc sometimes you'll find that the initial march, sit in, action etc are organised by the Party of Socialism and Liberation

They are successful in that they are an actual Communist party practicing democratic centralism, members are usually far more ideologically disciplined that the more disparate groups that don't have a democratically decided party line to adhere to, or criteria for membership

They are also successful in that they can actual mobilise people to get on the street

And they worry the authorities so much they write scare quotes like:

The Party for Socialism and Liberation’s Bay Area chapter has also promoted protests blocking traffic on I-880 in Oakland, with drivers stuck on the freeway for up to five hours in a form of civil terrorism, as well as sit-ins at other Bay Area colleges and universities.

The newest Revolution—joining the ranks of Mao’s and Castro’s—features keffiyeh-wearing service dogs, film screenings, and “people’s tribunals” against Stanford University.

As the sit-in 2.0 has commenced, with ongoing advertisements from and collaboration with the Party for Socialism and Liberation, a peace-loving tone has shifted to one of revolution. Maybe the revolution will end when admit weekend does, or when Stanford students face Office of Community Standards-sanctioned punishment. But, in the meantime, Stanford students and administration must be wary of masked Marxist visitors who have come in to make our campus a revolutionary training ground.

https://stanfordreview.org/stanford-protesters-collaborate-with-marxist-leninist-organization/