In fact, in 1899 while Saint Gemma was on the verge of dying from spinal meningitis, St. Gabriel (who died 37 years previously, in 1862) appeared to her in a vision and encouraged her to pray and make a novena to Jesus for a cure, in honor of His Sacred Heart. He then appeared to her each night of the novena, and prayed the novena prayers along with her. On the last day of the novena she was miraculously cured. From that day on she had a great devotion to Saint Gabriel.
Thus, we have another example of the intercession and the Communion of Saints.
Blessed be God in His angels and in His Saints!