20 Signs of Trouble in a New Religious Group

Since the closing of the Second Vatican Council, a number of new groups have arisen within the Church. Whereas many new groups start off on the right foot and maintain solid footing, others fall by the wayside. This may be due to poor doctrine or questionable practices.
...
Several years ago, Fr. [Francis] Morrisey proposed 15 criteria, or warning signs, when evaluating new associations within the Church. While these warning signs are not law per se — that is, law in the sense of legislation — most canonists accept these criteria as a solid guide when examining and assessing new associations within the Church. For those with access to a good ecclesiastical library, Fr. Morrisey presents and explains these fifteen criteria in his article “Canonical Associations...” published in Informationes, vol. 26, (2000), pp 88-109.

Great article by Pete Vere.