From wikipedia:

The earliest reference to an organised opposition to The Salvation Army was in August 1880 in Whitechapel, when The Unconverted Salvation Army was founded with its flag and motto of "Be just and fear not".

In 1881, Skeleton Armies were raised in Whitechapel, Exeter and Weston-super-Mare, and the name was quickly taken up elsewhere as other groups were formed in the south of England; there are no records of Skeleton Armies north of London. Membership was predominantly lower to middle working-class.[1]

In 'Blood on the Flag', Major Nigel Bovey identifies 21 north-of-London towns and cities, three of them in Scotland, in which the Skeleton Army opposed The Salvation Army

From their mission statement:

The SKELETON ARMY promotes education about programs that are actually addressing homelessness, substance abuse and domestic violence in the LGBTQIA+ community.

The SKELETON ARMY believes that mental health, substance abuse, and housing intervention should conform to best practices informed by the best empirical understanding of reality, intersectional sociology, and clinical psychology.

The SKELETON ARMY will expose organizations that do not follow best practices in treatment and shame them.